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Downloaded from
YTS.MX
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[Tristan Guttridge]
It's a hammer.
It's a hammer. Woo!
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[Tristan] In Andros,
there are some huge
great hammerheads.
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Official YIFY movies site:
YTS.MX
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[Andy Casagrande]
They can become
over a thousand pounds.
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They can literally reach
20 feet long.
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What do these
great hammerheads need to eat
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that will sustain that size?
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[Tristan] Most people really
consider the hammerhead
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as kind of like
a stingray specialist.
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But now new evidence
suggests...
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great hammerheads in Andros
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actually specialize
hunting other sharks.
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[man]
Working on another shark.
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[man] Holy [bleep].
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[Andy] Just recently
right here in Andros,
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some of the most
incredible footage
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was captured of a massive
great hammerhead
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hunting a shark
right underneath
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-a fisherman's boat.
-[man] Oh, God.
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[Khrys Carroll]
What's so unique
about Andros Island
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is the hammerheads have little
to no interaction with humans.
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[Tristan speaking]
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[Andy] Andros is the Wild,
Wild West.
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-[Tristan speaking]
-Whoa! Whoa!
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[Annie Guttridge]
We wanna know,
are these great hammerheads
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here in Andros
hunting smaller sharks?
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[Tristan] It's a hammer.
It's a hammer.
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-[man] You gotta be careful.
-[Annie] Careful, careful,
careful, careful.
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My name is
Dr. Tristan Guttridge.
I'm a behavioral ecologist.
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I've been working
with great hammerhead sharks
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for over a decade.
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To me, the great hammerhead
is one of the most iconic,
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charismatic shark species
that lives on the planet.
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They reach huge sizes.
I'm talking almost 20 feet.
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Plus, they have a head
that is shaped like a hammer.
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And they use that hammer
to pin prey down.
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Hammerheads
are perfectly evolved
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for hunting stingrays.
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[Tristan] But now new evidence
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here in Andros suggests
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these hammerheads
are reaching huge sizes
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by specializing
on hunting other sharks.
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[man] That is crazy.
Look at this hammerhead.
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Oh, it's trying
to eat a shark. Oh, my God.
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Holy [bleep].
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[Annie] We had a local fisher
here showing
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a great hammerhead
hunting on another shark.
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[man] He's working
on another shark.
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[man] Holy [bleep].
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The lemon shark was
probably like six feet.
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The hammerhead
was twice its size.
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[man] Oh, God.
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[Skye Minnis] And it was just
chasing it,
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trying to get a snack.
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[narrator] Researchers need
to determine if these videos
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are of isolated events
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or if they're a sign
of a shocking change
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to the diet of great
hammerheads of Andros Island.
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[Tristan] Andros is just
a few hundred miles
from the US.
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It's the biggest island
in The Bahamas.
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It's critical for us
to understand the role
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that these bigger predators
play in this system
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to keep it healthy.
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[narrator] But the only way
to figure out
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what these hammerheads
are eating
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is to send live tissue
samples to an outside lab.
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[Tristan] We're gonna take
muscle samples
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from the great hammerheads
themselves.
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We can take that sample
and we can analyze
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its chemical composition.
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We can learn about
what this hammerhead
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has been eating across
the last year of its life.
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[narrator] To get the sample,
they have to get
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within inches
of the hammerhead.
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To get this job done safely
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for both the humans
and the sharks,
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Tristan has assembled
an all-star team.
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[Tristan] All right. Load up.
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[narrator] Including
local shark experts,
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Khrys Carroll...
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I'm a marine scientist
with Saving the Blue.
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[narrator] and Skye Minnis.
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[Skye] I grew up in the ocean
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fishing in the shallows
with my grandmother.
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Now, I am a student at BAMSI.
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[narrator]
Another Andros local joining
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the team is Rontaa Bain,
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an experienced freediver
with the skills required
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to take biopsy samples
from free swimming
great hammerhead sharks.
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[Rontaa] The biggest
hammerhead I ever seen
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was four meters.
I thought it was a boat.
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[narrator]
Watching their backs
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is experienced
underwater cameraman,
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Andy Casagrande.
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For the past 20 years,
I've traveled
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all over the planet
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filming nearly every
species of shark.
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The great hammerhead
is one of my favorites.
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[narrator]
And Tristan's wife, Annie,
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a fearless freediver
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who has worked
with hammerheads
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for over a decade.
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Together, they've devised
a radical new plan
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to lure in giant hammerheads
for biopsies.
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[Tristan] Taking muscle
samples from the great
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hammerheads themselves
is extremely challenging.
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So we've designed
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three state-of-the-art decoys.
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We've got Octobot
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that's gonna mimic
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a large octopus
or a big squid.
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We've got Roboshark here
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that's gonna mimic
a blacknose,
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a small coastal species,
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to hopefully see what
hammerheads do with sharks.
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And, of course,
the return of our good friend,
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Roboray,
mimics a southern stingray.
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These look super realistic.
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[Andy] Roboray. Roboray.
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Last year we had
a great hammerhead
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come hard in on Roboray.
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And I'm excited
to try her again.
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[narrator]
Roboray is best suited
for attracting hammerheads
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in shallow
sandy bottom environments.
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But the team
has plans to explore
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all of Andros' unique
underwater habitats,
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and that's where Roboshark
and Octobot come into play.
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[Tristan] We've designed
Octobot to draw in
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a hammerhead
where cephalopods,
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squid are coming up
during the night to feed.
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Roboshark,
it's the perfect size
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for cruising reef habitat.
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The decoy delta force.
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I mean, I think any big shark,
they're gonna come in
and check it out.
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These decoys will create
a distraction
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and then you can come in--
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And get the biopsy.
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-[Tristan] Exactly.
-[Andy] Yes.
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Some people might think
it's very unorthodox,
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but in my opinion, unless
you think outside the box,
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swim outside the cage,
you're never gonna learn
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anything new
about these animals.
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Plan is to set up
on three different locations
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in real diverse habitats.
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Predator Channel
in this area here.
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[Khrys] Predator Channel,
we've known to see
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massive great hammerheads.
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[Tristan] The dropoff
is a perfect launching site
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for Octobot.
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And then we have Stingray
Shelf where we've seen
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lots of stingrays before,
other small sharks as well.
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I just have one question.
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What's up
with your Mohawk, ABC?
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It's not a Mohawk.
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It's a shark-hawk.
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-Sorry, buddy.
-[laughter]
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-[Tristan] Everyone ready?
-[Skye] Let's do it.
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[Tristan] Today, we're
starting at Predator Channel.
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Old faithful.
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It's the site that I've seen
the most great hammerheads
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here in Andros
and a great location
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to deploy Roboshark
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because it's this
transition zone
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from the dropoff
to the flats.
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That's where these
hammerheads are working
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'cause they
can launch attacks.
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[narrator] Besides being
a known hammerhead hotspot,
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Predator Channel
is also the location
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in which local fishermen
recently filmed
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the great hammerhead
hunting a smaller shark.
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[Annie] So we're here
in Predator Channel.
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We're setting up our
BRUV to deploy Roboshark.
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So we have some freshly
caught yellowtail.
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They're very abundant
in The Bahamas.
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We don't typically filet them
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but when we're working
with blunt knives,
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we make it work.
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Annie's gonna be preparing
bait for the BRUV,
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a baited remote underwater
video camera
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that has a live feed.
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And I'm gonna be scanning
the water
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for a great hammerhead.
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[dramatic music playing]
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[Khrys] What are you doing?
That is disgusting.
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This is the glamorous
part of shark week.
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No. Oh.
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-[Andy] Oh, God.
-No.
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I've just been sick
a little bit in my mouth.
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-You want another bit?
-[Khrys] I would
love another piece.
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-Please don't.
-Fresh mackerel
is probably pretty good.
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Mmm.
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-[laughs]
-Primo.
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[Andy] Wow.
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No.
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[dramatic music playing]
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[Tristan] Hammer! Hammer!
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[Skye] Hammerhead!
Hammer, hammer, hammer!
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People!
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[Annie] Where's Andy? Andy?
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[indistinct chatter]
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It's a big female.
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Get Roboshark ready.
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She's headed
towards the wreck.
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[narrator] Tristan has spotted
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the ideal candidate
for a tissue sample.
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A great hammerhead
that's around 12 feet long.
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Large enough
to be a shark killer.
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[Tristan speaking]
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[Khrys speaking]
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[Tristan speaking]
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[Andy speaking]
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[Tristan speaking]
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Just interesting.
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How is everything down there?
Anything yet?
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[Andy speaking]
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[Tristan speaking]
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[Andy speaking]
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00:10:24,870 --> 00:10:31,000
[Tristan speaking]
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Tristan, ABC, the live feed
is in position.
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Say cheese, guys.
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[Tristan speaking]
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[Andy speaking]
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[Tristan speaking]
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00:11:07,730 --> 00:11:10,870
[Tristan speaking]
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[narrator] Even though
this female tiger shark
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is just a juvenile,
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it could one day grow
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to be up to 16 feet long
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and weigh more
than 2,000 pounds.
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[Tristan speaking]
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[Tristan speaking]
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I think I see a fin
off the back of the boat.
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No, no, no.
There. There. It's a hammer.
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Oh. That's a hammerhead.
That's a hammerhead.
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Big. Yes.
237
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[Rontaa]
A hundred percent real.
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-Guys, that is [bleep] huge.
-Where is it?
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00:12:17,700 --> 00:12:20,270
-Holy [bleep].
-[Skye laughs]
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[Khrys speaking]
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00:12:26,070 --> 00:12:27,000
[Tristan speaking]
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00:12:27,970 --> 00:12:30,000
[Khrys speaking]
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00:12:30,070 --> 00:12:34,100
[Tristan speaking]
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00:12:34,100 --> 00:12:37,230
[dramatic music playing]
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[Tristan speaking]
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00:12:52,770 --> 00:12:56,100
[Tristan speaking]
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[Khrys speaking]
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00:13:12,370 --> 00:13:16,300
[Tristan speaking]
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-[Annie] Rontaa, biopsy.
-[narrator] With this 12-foot
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00:13:23,100 --> 00:13:25,400
hammerhead distracted
by Roboshark,
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00:13:25,470 --> 00:13:26,830
the team's freediver
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00:13:26,900 --> 00:13:28,830
and biopsy specialist,
Rontaa,
253
00:13:28,830 --> 00:13:30,100
jumps in the water
254
00:13:30,100 --> 00:13:31,400
so he can get in position
255
00:13:31,400 --> 00:13:32,830
for a tissue sample.
256
00:13:33,830 --> 00:13:35,370
[Tristan speaking]
257
00:13:48,100 --> 00:13:49,800
-Whoa.
-Oh, my God.
258
00:13:50,930 --> 00:13:53,030
[Tristan speaking]
259
00:13:56,300 --> 00:14:00,100
[narrator] By triggering
a predatory attack
from the hammerhead,
260
00:14:00,100 --> 00:14:03,930
Roboshark has done its job
a little too well.
261
00:14:03,930 --> 00:14:05,670
And with the shark
leaving the area,
262
00:14:05,730 --> 00:14:07,530
the team calls the dive.
263
00:14:08,670 --> 00:14:12,800
[Tristan speaking]
264
00:14:14,370 --> 00:14:15,930
[Andy speaking]
265
00:14:15,930 --> 00:14:17,570
[Rontaa speaking]
266
00:14:17,570 --> 00:14:19,470
You guys head back in.
267
00:14:19,530 --> 00:14:22,000
[Tristan speaking]
268
00:14:23,900 --> 00:14:27,300
Wow. That was
a beautiful hammerhead.
269
00:14:27,370 --> 00:14:29,730
-How big was it?
-[Andy] Maybe 12 feet.
270
00:14:29,770 --> 00:14:32,270
Super confident shark.
271
00:14:32,300 --> 00:14:34,300
[narrator] Even though
Roboshark malfunctioned
272
00:14:34,300 --> 00:14:37,770
before the team had a chance
to biopsy the hammerhead,
273
00:14:37,800 --> 00:14:40,270
they still made
important observations.
274
00:14:40,300 --> 00:14:42,470
[Andy] Tristan, that
was pretty incredible, man.
275
00:14:42,470 --> 00:14:44,630
Roboshark didn't stand
a chance.
276
00:14:44,670 --> 00:14:46,300
-[makes sound]
-[laughs]
277
00:14:46,300 --> 00:14:48,100
[Andy] Yeah. That's pretty
much what happened.
278
00:14:48,100 --> 00:14:50,200
With our decoy,
we were able to elicit
279
00:14:50,200 --> 00:14:52,470
predatory behaviors
of hammerheads that might
280
00:14:52,530 --> 00:14:55,570
be cruising
that reef habitat.
281
00:14:55,570 --> 00:14:58,830
This is fantastic evidence
that showcases
282
00:14:58,830 --> 00:15:01,030
the predatory prowess
of these giant
283
00:15:01,100 --> 00:15:02,270
great hammerheads.
284
00:15:02,300 --> 00:15:03,670
But now we want to switch
285
00:15:03,730 --> 00:15:06,370
things up
and bring out Octobot.
286
00:15:06,400 --> 00:15:09,770
We know that hammerheads
feed out in the deep water,
287
00:15:09,800 --> 00:15:12,400
hitting squid
and other cephalopods.
288
00:15:12,400 --> 00:15:14,570
So what I'm hoping
to do is see
289
00:15:14,630 --> 00:15:16,630
what big hammerhead
we can intercept
290
00:15:16,670 --> 00:15:19,100
that's cruising that zone.
291
00:15:19,100 --> 00:15:21,400
[narrator] Octobot was
designed specifically
292
00:15:21,400 --> 00:15:25,200
for attracting hammerheads
at night near dropoffs.
293
00:15:26,270 --> 00:15:28,770
This is where the shallows
suddenly descent
294
00:15:28,800 --> 00:15:31,830
into thousands
of feet of open water.
295
00:15:41,570 --> 00:15:43,770
As we know, octopus, squid,
296
00:15:43,800 --> 00:15:45,470
they come up at night to feed,
297
00:15:45,470 --> 00:15:48,030
and we have Octobot here.
298
00:15:48,100 --> 00:15:51,770
Tonight will be a dusk dive
on the dropoff.
299
00:15:51,800 --> 00:15:54,400
We're gonna swim Octobot
right over the dropoff
300
00:15:54,470 --> 00:15:57,100
that goes down
to almost 10,000 feet.
301
00:16:01,470 --> 00:16:03,930
And this is
where cephalopods,
302
00:16:03,930 --> 00:16:07,670
squid are coming up
during the night to feed.
303
00:16:07,670 --> 00:16:10,270
So I'm taking the lights
for bioluminescence, right?
304
00:16:10,300 --> 00:16:12,000
Right.
So we've got the visual cue
305
00:16:12,030 --> 00:16:13,830
of the actual octopus
and we've also got
306
00:16:13,830 --> 00:16:15,570
the lights too to mimic that.
307
00:16:15,570 --> 00:16:17,830
-That's pretty awesome.
-[Tristan] We take this
308
00:16:17,900 --> 00:16:20,300
decoy down off the dropoff.
309
00:16:20,370 --> 00:16:22,170
Maybe we'll get a hit
from one of these
310
00:16:22,200 --> 00:16:25,400
big hammerheads that feeds out
in the pelagic zone,
311
00:16:25,470 --> 00:16:28,030
which is very different to
some of the hammers that feed
312
00:16:28,030 --> 00:16:30,670
on stingrays
and sharks on the flats.
313
00:16:30,670 --> 00:16:33,300
[narrator] The pelagic zone
is the open ocean
314
00:16:33,300 --> 00:16:35,100
far from shore.
315
00:16:35,170 --> 00:16:37,670
And researchers believe
great hammerheads hunt
316
00:16:37,670 --> 00:16:41,000
at night here, where they
can encounter lethal deep sea
317
00:16:41,030 --> 00:16:43,400
predators like swordfish
318
00:16:43,470 --> 00:16:45,770
and even the giant squid.
319
00:16:47,000 --> 00:16:49,100
In this dangerous
environment,
320
00:16:49,100 --> 00:16:52,830
darkness can provide cover
from prey that can bite back.
321
00:16:52,900 --> 00:16:54,400
So what do you think?
322
00:16:54,470 --> 00:16:57,570
Yeah, let's get kraken.
323
00:16:57,630 --> 00:16:59,400
Oh, my God.
324
00:16:59,400 --> 00:17:01,030
[Andy] Every time I go down
325
00:17:01,100 --> 00:17:03,000
in the dark underwater,
326
00:17:03,030 --> 00:17:04,730
it's a little unnerving
327
00:17:04,770 --> 00:17:06,900
because you can't see much
further than your face.
328
00:17:09,730 --> 00:17:12,099
These rebreathers,
they're great
but it's hard work.
329
00:17:12,099 --> 00:17:16,000
-Yeah.
-[Tristan] So check
everything before you go in.
330
00:17:16,030 --> 00:17:17,829
[narrator] Besides
monitoring their complex
331
00:17:17,900 --> 00:17:20,670
rebreather equipment,
Tristan will also go
332
00:17:20,730 --> 00:17:23,670
for the all-important
hammerhead tissue sample,
333
00:17:23,730 --> 00:17:25,900
-if one appears.
-[Andy] All right.
334
00:17:25,930 --> 00:17:28,030
-Feeling good, Tristan?
-Oh, yeah. I'm ready.
335
00:17:28,030 --> 00:17:29,830
[Andy] All right.
Let's do this.
336
00:17:29,830 --> 00:17:32,930
Looks good. We'll see you
in an hour or two.
337
00:17:34,530 --> 00:17:38,800
[Annie] Five,
four, three, two, one.
338
00:17:56,670 --> 00:18:02,300
[Tristan speaking]
339
00:18:15,030 --> 00:18:17,470
[Andy speaking]
340
00:18:18,830 --> 00:18:22,530
[Tristan speaking]
341
00:18:23,300 --> 00:18:24,670
[Andy speaking]
342
00:18:26,630 --> 00:18:28,400
[narrator] Blacknose sharks
can be found
343
00:18:28,400 --> 00:18:30,930
all over
the southeast Atlantic.
344
00:18:31,000 --> 00:18:34,930
The largest this species
gets is around six feet long,
345
00:18:34,930 --> 00:18:38,830
making them ideal prey
for a shark-killing
hammerhead.
346
00:18:39,570 --> 00:18:43,530
[Tristan speaking]
347
00:18:57,930 --> 00:19:02,270
[Andy speaking]
348
00:19:09,270 --> 00:19:12,470
[Tristan speaking]
349
00:19:12,530 --> 00:19:14,300
[Andy speaking]
350
00:19:18,030 --> 00:19:20,830
[Tristan speaking]
351
00:19:30,570 --> 00:19:33,300
[Tristan speaking]
352
00:19:37,200 --> 00:19:39,670
[Tristan speaking]
353
00:19:47,830 --> 00:19:50,030
[Andy speaking]
354
00:19:56,030 --> 00:19:58,200
[Tristan speaking]
355
00:20:08,670 --> 00:20:12,030
[Tristan speaking]
356
00:20:12,100 --> 00:20:15,170
[Andy speaking]
357
00:20:23,000 --> 00:20:24,670
[Tristan speaking]
358
00:20:41,670 --> 00:20:42,800
[Andy speaking]
359
00:20:46,670 --> 00:20:49,670
[Tristan speaking]
360
00:20:53,200 --> 00:20:54,830
[narrator] Before attacking,
361
00:20:54,830 --> 00:20:57,000
great hammerheads
scan their surroundings
362
00:20:57,030 --> 00:21:00,900
with their massive
hammer-shaped cephalofoils.
363
00:21:00,930 --> 00:21:03,200
These are covered
in electroreceptors
364
00:21:03,200 --> 00:21:05,570
called ampullae of Lorenzini,
365
00:21:05,570 --> 00:21:07,770
which allow them to detect
electrical currents
366
00:21:07,800 --> 00:21:09,030
like heartbeats
367
00:21:09,030 --> 00:21:11,530
or the small electric motors
368
00:21:11,570 --> 00:21:12,930
in Octobot.
369
00:21:16,830 --> 00:21:18,170
[Tristan] Oh!
370
00:21:24,170 --> 00:21:26,570
[Andy speaking]
371
00:21:27,730 --> 00:21:30,830
[Tristan speaking]
372
00:21:39,630 --> 00:21:41,400
[Andy speaking]
373
00:21:45,030 --> 00:21:48,400
[Tristan speaking]
374
00:21:58,170 --> 00:22:01,000
[Tristan speaking]
375
00:22:08,170 --> 00:22:10,800
[Tristan speaking]
376
00:22:10,830 --> 00:22:12,300
[Andy speaking]
377
00:22:13,370 --> 00:22:14,830
[narrator] In the dark,
378
00:22:14,900 --> 00:22:17,530
off Andros Island
in The Bahamas,
379
00:22:17,570 --> 00:22:20,470
Tristan Guttridge
and Andy Casagrande
380
00:22:20,530 --> 00:22:23,670
are using a squid decoy
called Octobot
381
00:22:23,670 --> 00:22:26,170
to lure in
monster hammerheads.
382
00:22:34,470 --> 00:22:37,570
[Tristan speaking]
383
00:22:39,830 --> 00:22:41,170
[Andy speaking]
384
00:22:43,730 --> 00:22:46,530
[Tristan speaking]
385
00:23:03,370 --> 00:23:05,100
We lost Octobot.
386
00:23:05,100 --> 00:23:07,000
Something just pulled it
over the edge.
387
00:23:07,030 --> 00:23:09,100
[Annie]
Yeah. We saw something big.
388
00:23:09,170 --> 00:23:11,200
The current is quite strong.
389
00:23:16,200 --> 00:23:19,670
Wow. I mean,
we were in great position.
390
00:23:19,730 --> 00:23:22,300
We were right on the edge
of the drop off,
391
00:23:22,370 --> 00:23:25,670
and then it yanked
straight off my hand.
392
00:23:25,730 --> 00:23:27,100
Dude.
393
00:23:27,170 --> 00:23:30,530
Octobot live on in memory.
394
00:23:30,570 --> 00:23:31,930
Octobot.
395
00:23:32,000 --> 00:23:33,730
[chuckles]
396
00:23:37,570 --> 00:23:39,200
[Tristan] Last night
was crazy.
397
00:23:39,270 --> 00:23:41,470
We had a huge
great hammerhead.
398
00:23:44,830 --> 00:23:47,470
And as I was on the edge
of the drop off,
399
00:23:48,470 --> 00:23:50,470
I was holding the controller
400
00:23:50,470 --> 00:23:52,470
and it got pulled
out of my hands.
401
00:23:52,470 --> 00:23:54,200
[Andy] By the time we got
to the drop off,
402
00:23:54,200 --> 00:23:55,900
Octobot was gone
403
00:23:55,930 --> 00:23:57,200
and it was impossible
to retrieve.
404
00:23:57,270 --> 00:23:58,670
We're just not equipped to go
405
00:23:58,730 --> 00:23:59,930
that deep to recover.
406
00:24:00,000 --> 00:24:01,570
-That actually was a shark.
-That was... That was a shark.
407
00:24:01,570 --> 00:24:03,530
-That is a shark.
-That is...
That was something.
408
00:24:03,570 --> 00:24:05,670
[narrator] Analysis
from Octobot's camera
409
00:24:05,730 --> 00:24:07,570
at the moment
the controller was ripped
410
00:24:07,630 --> 00:24:09,270
from Tristan's hands,
411
00:24:10,000 --> 00:24:12,670
shows something coming
into frame.
412
00:24:12,730 --> 00:24:16,300
But whether or not it was a
great hammerhead is unclear.
413
00:24:16,300 --> 00:24:19,530
If it is, the decoys might be
working too well
414
00:24:19,570 --> 00:24:21,900
in eliciting
predatory behavior.
415
00:24:26,530 --> 00:24:28,200
With Octobot gone
416
00:24:28,200 --> 00:24:30,730
and Roboshark in the shop
for repairs,
417
00:24:30,730 --> 00:24:33,930
the team turns
to their last decoy.
418
00:24:34,000 --> 00:24:35,530
[Andy] Now it's time
to break out
419
00:24:35,570 --> 00:24:37,830
our old pal, Roboray.
420
00:24:37,900 --> 00:24:39,570
And we're gonna head
to this awesome spot
421
00:24:39,630 --> 00:24:40,830
called Gibson Cay.
422
00:24:40,900 --> 00:24:42,730
It's a very productive area.
423
00:24:42,730 --> 00:24:44,200
There's sharks here.
There's stingrays.
424
00:24:44,200 --> 00:24:45,930
There's lots of game fish.
425
00:24:45,930 --> 00:24:48,900
This place is a known area...
426
00:24:48,930 --> 00:24:51,900
where hammerheads come
to hunt other sharks.
427
00:24:51,930 --> 00:24:54,730
This is where Annie and I
saw the hammerhead predating
428
00:24:54,800 --> 00:24:56,270
on a shark in the shallows.
429
00:24:56,300 --> 00:24:57,730
[Annie] Oh, my God!
430
00:24:57,730 --> 00:24:59,300
She's hunting.
She's on the reef shark.
431
00:24:59,300 --> 00:25:01,830
It's definitely hunting.
Oh, my God!
432
00:25:01,830 --> 00:25:03,370
My God. Look at it there.
433
00:25:03,370 --> 00:25:05,570
[Rontaa] It's eating
another shark.
434
00:25:05,570 --> 00:25:07,570
So we split up into two teams.
435
00:25:07,630 --> 00:25:10,630
I'm here with Khrys and Skye.
436
00:25:10,670 --> 00:25:12,300
Can you hand me that BRUV?
437
00:25:12,300 --> 00:25:14,100
[Andy] And we got Tristan
and Annie.
438
00:25:14,170 --> 00:25:16,100
Right now,
they're fishing over there.
439
00:25:16,100 --> 00:25:17,570
They're hoping
to catch a big hammerhead
440
00:25:17,630 --> 00:25:18,730
and pull a biopsy,
441
00:25:18,800 --> 00:25:20,370
because we wanna know
442
00:25:20,370 --> 00:25:22,930
what these monster hammerheads
are eating.
443
00:25:23,930 --> 00:25:25,430
This is number one, so 1A.
444
00:25:25,470 --> 00:25:27,070
It's why I like working
with my wife
445
00:25:27,100 --> 00:25:29,930
'cause she's way
more organized than me.
446
00:25:29,930 --> 00:25:31,300
[narrator]
With two decoys down
447
00:25:31,300 --> 00:25:33,370
and no tissue samples yet,
448
00:25:33,370 --> 00:25:36,270
Tristan and Annie turn
to drumline fishing,
449
00:25:36,300 --> 00:25:38,900
a tried and true method
for hooking up hammerheads
450
00:25:38,930 --> 00:25:41,470
to get the biopsies
they need.
451
00:25:41,470 --> 00:25:45,030
[Tristan] I haven't entirely
abandoned the decoys
452
00:25:45,070 --> 00:25:47,730
but we have now moved
to a more traditional method
453
00:25:47,730 --> 00:25:49,300
which is catch and release,
454
00:25:49,370 --> 00:25:51,730
where we can take
a biological tissue sample,
455
00:25:51,800 --> 00:25:53,370
muscle from the side
of a vessel
456
00:25:53,370 --> 00:25:55,170
in a more controlled manner.
457
00:25:56,170 --> 00:25:57,570
So we're deploying
some drumlines.
458
00:25:57,630 --> 00:25:59,170
We have a weight
459
00:25:59,200 --> 00:26:01,930
which is connected
to this long yellow line,
460
00:26:02,000 --> 00:26:03,930
which is then connected
to some buoys
461
00:26:04,000 --> 00:26:05,200
and then some mono.
462
00:26:06,170 --> 00:26:07,830
[Tristan] The advantage
of using the drumlines
463
00:26:07,830 --> 00:26:09,370
is that we can
actually have the animal
464
00:26:09,370 --> 00:26:11,270
next to the side
of the vessel
465
00:26:11,300 --> 00:26:13,370
and be able to get much
more detailed information
466
00:26:13,370 --> 00:26:14,830
by being able
to capture them.
467
00:26:14,900 --> 00:26:16,530
There is a downside.
468
00:26:16,570 --> 00:26:19,370
It's quite a high
pressure situation.
469
00:26:19,370 --> 00:26:22,430
You're dealing with a huge
animal that has big teeth,
470
00:26:22,470 --> 00:26:24,930
that can slap you in the face
with its big tail.
471
00:26:25,000 --> 00:26:27,030
So you really need
to be quick and efficient
472
00:26:27,070 --> 00:26:28,930
and make sure
that you're being safe
473
00:26:28,930 --> 00:26:30,930
when you're working
with these big sharks.
474
00:26:32,300 --> 00:26:33,800
-[Annie] Tristan, you ready?
-Yeah.
475
00:26:33,830 --> 00:26:35,100
A little bit further.
476
00:26:35,170 --> 00:26:36,830
[Annie chuckles] Not ready.
477
00:26:36,830 --> 00:26:38,170
[Tristan]
Okay. It's good here.
478
00:26:40,470 --> 00:26:42,800
We're actually gonna be
set anchored
479
00:26:42,830 --> 00:26:45,670
just around 500 feet away
from these rigs
480
00:26:45,670 --> 00:26:47,300
so we can see
if anything gets caught
481
00:26:47,370 --> 00:26:49,170
and then we can go
straight to it,
482
00:26:49,200 --> 00:26:52,070
work it up, measure it,
take our muscle sample,
483
00:26:52,100 --> 00:26:53,830
and then the shark
will hopefully be swimming
484
00:26:53,830 --> 00:26:56,830
from bite to release
within 12 or 15 minutes.
485
00:26:58,030 --> 00:27:00,100
-Nice.
-Very nice.
486
00:27:00,170 --> 00:27:02,030
We're now set up.
You can see the rigs.
487
00:27:02,070 --> 00:27:04,370
We've got one, two,
three, four, five
488
00:27:04,370 --> 00:27:06,630
-across the channel.
-[Annie] When a hammer hits,
489
00:27:06,670 --> 00:27:08,370
we certainly will know
about it.
490
00:27:09,630 --> 00:27:11,200
[narrator]
With their drumlines set,
491
00:27:11,270 --> 00:27:13,670
Annie and Tristan wait
for a hit,
492
00:27:13,670 --> 00:27:16,570
while Andy, Khrys, and Skye
prepare to jump in
493
00:27:16,630 --> 00:27:18,670
with Roboray.
494
00:27:18,670 --> 00:27:20,100
I think this
is the perfect place.
495
00:27:20,170 --> 00:27:23,270
[Andy] All right.
Roboray, game time.
496
00:27:23,300 --> 00:27:25,430
[Skye] We're gonna use
the return of Roboray
497
00:27:25,470 --> 00:27:28,100
to get the hammerheads
in really close
498
00:27:28,100 --> 00:27:30,730
to collect a tissue sample.
499
00:27:30,730 --> 00:27:33,470
Me and Khrys, we're
gonna have front row seat
500
00:27:33,530 --> 00:27:35,670
and we're gonna see
what comes in.
501
00:27:35,670 --> 00:27:37,470
I'll keep my eyes open
for any hammers
502
00:27:37,530 --> 00:27:39,370
or any other tigers
that might be in the area.
503
00:27:39,430 --> 00:27:41,200
What could go wrong?
504
00:27:41,270 --> 00:27:43,570
-[Skye] Let's do this.
-[Khrys] Okay. Cool.
505
00:27:50,470 --> 00:27:52,000
[narrator]
The team has also deployed
506
00:27:52,030 --> 00:27:53,800
over a dozen BRUVs,
507
00:27:53,830 --> 00:27:55,300
which are baited cameras
508
00:27:55,370 --> 00:27:58,430
rigged with up to 25 pounds
of tuna.
509
00:27:58,470 --> 00:28:00,570
Between the BRUVs
and Roboray,
510
00:28:00,570 --> 00:28:02,830
any great hammerheads
in the area
511
00:28:02,900 --> 00:28:04,570
are in for a feast.
512
00:28:10,200 --> 00:28:13,300
[Skye speaking]
513
00:28:15,570 --> 00:28:16,800
[Khrys speaking]
514
00:28:37,900 --> 00:28:40,470
[Skye speaking]
515
00:28:40,530 --> 00:28:43,470
[Khrys speaking]
516
00:28:44,800 --> 00:28:46,830
[narrator] Nurse sharks
are bottom feeders.
517
00:28:46,830 --> 00:28:50,100
They eat almost anything
they find on the ocean floor,
518
00:28:50,170 --> 00:28:53,530
crushing coral, crustaceans,
and small bony fish
519
00:28:53,570 --> 00:28:56,730
with their many rows
of small serrated teeth.
520
00:28:59,270 --> 00:29:02,930
[Skye speaking]
521
00:29:02,930 --> 00:29:05,930
[Khrys speaking]
522
00:29:05,930 --> 00:29:08,630
[Skye speaking]
523
00:29:11,030 --> 00:29:12,730
[narrator] Another species
takes interest
524
00:29:12,730 --> 00:29:14,300
in the team's bait.
525
00:29:15,200 --> 00:29:17,470
Reef sharks like this
are a cornerstone
526
00:29:17,530 --> 00:29:20,000
of the habitats
around Andros.
527
00:29:22,530 --> 00:29:25,370
[Skye speaking]
528
00:29:27,670 --> 00:29:28,900
[narrator] Reef sharks
might have learned
529
00:29:28,930 --> 00:29:30,570
to find safety in numbers,
530
00:29:30,570 --> 00:29:32,200
because when they're young,
531
00:29:32,200 --> 00:29:34,470
they're hunted
by great hammerheads.
532
00:29:40,670 --> 00:29:43,470
[Skye speaking]
533
00:29:49,370 --> 00:29:51,030
[Khrys speaking]
534
00:30:02,800 --> 00:30:03,800
[Skye] Whoa!
535
00:30:08,130 --> 00:30:10,300
[Khrys speaking]
536
00:30:11,670 --> 00:30:13,870
[Skye speaking]
537
00:30:13,930 --> 00:30:16,870
[Khrys speaking]
538
00:30:17,840 --> 00:30:20,030
[Skye speaking]
539
00:30:20,100 --> 00:30:21,930
[Khrys speaking]
540
00:30:23,030 --> 00:30:25,740
[Skye speaking]
541
00:30:25,770 --> 00:30:26,970
[Andy] I copy you.
542
00:30:28,230 --> 00:30:29,670
Roboray is away.
543
00:30:29,670 --> 00:30:33,130
Repeat,
Roboray is in the water.
544
00:30:33,200 --> 00:30:36,300
[suspenseful music playing]
545
00:30:44,840 --> 00:30:47,400
[Andy] We're sending
in Rontaa.
546
00:30:47,400 --> 00:30:49,030
[narrator]
With Roboray deployed,
547
00:30:49,100 --> 00:30:50,670
Rontaa hits the water,
548
00:30:50,740 --> 00:30:52,600
floating at the surface
while he waits
549
00:30:52,600 --> 00:30:54,100
for the perfect opportunity
550
00:30:54,130 --> 00:30:56,230
to go in for a tissue sample.
551
00:30:58,400 --> 00:31:00,570
[Andy] Rontaa now is hovering
above you guys.
552
00:31:00,600 --> 00:31:01,670
[Khrys speaking]
553
00:31:04,330 --> 00:31:07,400
[Skye speaking]
554
00:31:12,100 --> 00:31:13,770
[Khrys speaking]
555
00:31:26,130 --> 00:31:29,230
[Skye speaking]
556
00:31:31,500 --> 00:31:34,030
[Khrys speaking]
557
00:31:41,770 --> 00:31:43,030
[Skye] Whoa!
558
00:31:47,370 --> 00:31:50,470
[Khrys speaking]
559
00:31:52,370 --> 00:31:54,870
[Skye speaking]
560
00:31:56,570 --> 00:31:59,670
[Khrys speaking]
561
00:32:01,740 --> 00:32:05,500
[Andy speaking]
562
00:32:06,970 --> 00:32:08,670
[Khrys speaking]
563
00:32:08,670 --> 00:32:11,770
[Skye speaking]
564
00:32:15,970 --> 00:32:18,870
[Khrys speaking]
565
00:32:18,930 --> 00:32:20,130
[Andy] I copy you, Khrys.
566
00:32:24,670 --> 00:32:27,570
[narrator] Just like
with Roboshark and Octobot,
567
00:32:28,870 --> 00:32:30,930
Roboray succeeds in eliciting
568
00:32:30,970 --> 00:32:32,770
a strong predatory response
569
00:32:32,840 --> 00:32:34,770
from a great hammerhead.
570
00:32:34,840 --> 00:32:37,600
But the shark takes off
before the team has a chance
571
00:32:37,600 --> 00:32:39,600
to obtain a biopsy.
572
00:32:39,600 --> 00:32:41,030
-Yeah.
-Whoo!
573
00:32:41,030 --> 00:32:42,670
What about that dive, guys.
574
00:32:42,670 --> 00:32:45,130
-That was awesome.
-It was amazing.
575
00:32:45,130 --> 00:32:46,870
The surge was kind of gnarly
576
00:32:46,870 --> 00:32:49,670
but the sharks definitely came
in full effect.
577
00:32:49,670 --> 00:32:52,030
That moment when we saw
the hammerhead swim above us--
578
00:32:52,100 --> 00:32:54,600
Yeah. That was...
something else.
579
00:32:54,670 --> 00:32:56,400
It was like a buffet
for the hammerhead.
580
00:32:56,470 --> 00:32:57,870
You had reefies,
581
00:32:57,930 --> 00:33:00,770
you had the little nurse,
and Roboray.
582
00:33:00,770 --> 00:33:02,570
[Andy] Nice work.
583
00:33:02,600 --> 00:33:04,130
[makes explosive sound]
584
00:33:06,970 --> 00:33:08,570
One, two, three.
585
00:33:08,600 --> 00:33:09,670
So we just put
another one there.
586
00:33:09,740 --> 00:33:11,570
Four and five.
587
00:33:11,600 --> 00:33:13,470
No bait. Rebait.
588
00:33:13,500 --> 00:33:15,970
-[Annie] What bait is it?
-[Tristan] Cuda.
589
00:33:16,030 --> 00:33:18,400
So we've had some ups
and downs with the decoys.
590
00:33:18,470 --> 00:33:20,100
These are smart sharks.
591
00:33:20,130 --> 00:33:21,470
But we do have a backup
592
00:33:21,500 --> 00:33:23,670
and that is we try
and catch one of these animals
593
00:33:23,740 --> 00:33:25,970
and take a biopsy
on the side of the boat.
594
00:33:26,030 --> 00:33:28,570
There's a higher chance
of getting hooked by a hook
595
00:33:28,600 --> 00:33:31,130
than getting bit
by a shark, definitely.
596
00:33:31,200 --> 00:33:33,030
-Ready to go in?
-[Rontaa] Yup.
597
00:33:34,470 --> 00:33:35,670
Bait in.
598
00:33:35,670 --> 00:33:38,370
Like a well-oiled machine,
599
00:33:38,400 --> 00:33:40,500
research machine.
600
00:33:42,600 --> 00:33:43,870
Shark one! Shark one!
601
00:33:43,930 --> 00:33:46,870
-Shark one!
-Oh, okay. Yes!
602
00:33:46,930 --> 00:33:48,300
Oh, wow. That's moving.
603
00:33:50,600 --> 00:33:53,300
Stephano, move round
and go up the channel
604
00:33:53,330 --> 00:33:54,930
and then we'll pull it in
from there.
605
00:33:57,600 --> 00:34:00,400
[narrator] The team's patience
finally pays off...
606
00:34:01,400 --> 00:34:03,400
as Tristan and Annie
get a hit
607
00:34:03,400 --> 00:34:05,030
on one of their drum lines.
608
00:34:10,500 --> 00:34:12,230
[Tristan] Slow down.
Slow down.
609
00:34:13,130 --> 00:34:14,600
It's here on the left.
610
00:34:15,400 --> 00:34:17,130
It is a big shark
611
00:34:17,130 --> 00:34:19,500
'cause it's towing that line.
612
00:34:19,570 --> 00:34:21,840
[Annie] Definitely a big
shark, a hundred percent.
613
00:34:21,870 --> 00:34:23,500
[Tristan]
Can't see what it is.
614
00:34:23,500 --> 00:34:25,100
-Go over.
-[Skye] We're right...
615
00:34:25,130 --> 00:34:27,100
We're right on top of it.
616
00:34:27,130 --> 00:34:29,500
Just be careful it doesn't get
in your legs, Julian.
617
00:34:30,500 --> 00:34:31,969
-[Julian] It's a hammer!
-[Tristan] It's a hammer!
618
00:34:31,969 --> 00:34:33,469
-It's a hammer!
-[Julian] Oh, my God!
619
00:34:33,500 --> 00:34:35,230
-[Tristan] Woo!
-[Julian] Woo!
620
00:34:35,300 --> 00:34:36,770
It's a hammerhead.
621
00:34:36,840 --> 00:34:37,840
We've caught a hammerhead
622
00:34:37,870 --> 00:34:39,030
in the channel.
623
00:34:42,030 --> 00:34:43,739
That is not small either.
624
00:34:43,770 --> 00:34:44,870
It's not small.
625
00:34:48,500 --> 00:34:50,770
[narrator] This hammerhead
is 12 feet long,
626
00:34:50,840 --> 00:34:53,030
big enough to hunt
other sharks.
627
00:34:53,030 --> 00:34:56,130
But the only way to see
if this one is a shark killer
628
00:34:56,130 --> 00:34:58,030
is to get the tissue sample.
629
00:35:05,130 --> 00:35:06,770
[Annie] Definitely female
I say, yeah?
630
00:35:06,770 --> 00:35:08,130
-Yeah. Yeah.
-[Julian] Go, go, go, go, go,
631
00:35:08,200 --> 00:35:09,500
go, go, go, go, go.
632
00:35:09,570 --> 00:35:11,200
[Tristan] Can't get the tail.
633
00:35:11,230 --> 00:35:14,030
[grunts] We radioed them
to let them know.
634
00:35:15,030 --> 00:35:16,840
[Stephano speaking]
635
00:35:16,870 --> 00:35:18,840
[Andy] Is it a hambone
or they don't know?
636
00:35:18,870 --> 00:35:20,670
-[man] Is it hammer?
-[Stephano speaking]
637
00:35:20,670 --> 00:35:21,970
-It's a hammer. It's a hammer.
-What?
638
00:35:22,030 --> 00:35:23,970
-All right.
Let's go. Let's go.
-[Andy] Put the drone up.
639
00:35:30,870 --> 00:35:32,670
[Skye] Oh, look at that.
640
00:35:32,670 --> 00:35:34,670
They got it.
641
00:35:34,670 --> 00:35:35,740
[Khrys] That is awesome.
642
00:35:35,770 --> 00:35:37,330
What a beauty.
643
00:35:37,370 --> 00:35:39,130
Tristan and Annie
just caught a hammerhead.
644
00:35:39,130 --> 00:35:40,670
They're gonna get a biopsy.
645
00:35:40,670 --> 00:35:41,770
I'm gonna jump in the water
646
00:35:41,840 --> 00:35:43,100
to film the release.
647
00:35:49,230 --> 00:35:50,870
[Annie] All right. Here we go.
This is it, people.
648
00:35:50,870 --> 00:35:53,130
This is it. Nice and easy.
649
00:35:53,130 --> 00:35:54,770
This is it.
650
00:35:54,770 --> 00:35:56,770
Here she comes.
651
00:35:56,770 --> 00:35:58,130
[Tristan] Yeah, I've got it.
652
00:35:59,130 --> 00:36:00,570
Grab its head.
653
00:36:02,130 --> 00:36:03,500
Okay. Pass the biopsy.
654
00:36:03,570 --> 00:36:05,230
[Annie] Look out. Look out.
655
00:36:07,300 --> 00:36:08,400
-Tristan, stand by.
-Yeah. I know.
656
00:36:08,400 --> 00:36:10,230
I'm ready.
657
00:36:10,300 --> 00:36:11,600
[Annie] All right. She's set.
658
00:36:11,600 --> 00:36:13,870
[Tristan]
Let it go. Let it go.
659
00:36:13,930 --> 00:36:15,030
[Annie] Careful, careful,
careful. Careful!
660
00:36:18,170 --> 00:36:19,140
[Tristan] Grab its head.
661
00:36:21,400 --> 00:36:22,700
[Annie] Careful, careful,
careful.
662
00:36:22,700 --> 00:36:23,900
-Careful!
-[Tristan] Let it go.
663
00:36:23,970 --> 00:36:25,270
[Annie] Tristan, what now?
664
00:36:25,270 --> 00:36:26,970
[Tristan] Okay.
Pass the biopsy.
665
00:36:29,700 --> 00:36:31,500
All right. That's good enough.
666
00:36:33,530 --> 00:36:35,330
All right. We're gonna have
to release it.
667
00:36:35,330 --> 00:36:36,800
[Annie] She's set.
668
00:36:38,500 --> 00:36:39,700
-She's about ready to go.
-[Tristan] That's it.
669
00:36:39,700 --> 00:36:41,430
-Keep trying
to get the hook out.
-[Annie] Look out.
670
00:36:41,430 --> 00:36:42,400
-Tristan, stand by.
-Yeah. I know.
671
00:36:42,430 --> 00:36:43,430
I'm ready.
672
00:36:44,430 --> 00:36:46,070
-She's good? She free?
-She's free.
673
00:36:46,070 --> 00:36:48,330
[Tristan] Let her go.
Let her go.
674
00:36:48,330 --> 00:36:49,630
She swims.
675
00:36:49,670 --> 00:36:52,700
[dramatic music playing]
676
00:36:59,530 --> 00:37:01,400
[cheering]
677
00:37:04,770 --> 00:37:05,970
Ow!
678
00:37:06,040 --> 00:37:07,400
Sorry.
679
00:37:11,970 --> 00:37:13,400
[Tristan] We got
the muscle sample.
680
00:37:13,430 --> 00:37:14,900
We can essentially track
681
00:37:14,970 --> 00:37:16,770
what that hammerhead
has been eating
682
00:37:16,800 --> 00:37:18,330
the last year.
683
00:37:18,400 --> 00:37:21,230
You are essentially
what you eat.
684
00:37:21,270 --> 00:37:23,330
[narrator] At just
under 12 feet long,
685
00:37:23,400 --> 00:37:26,070
the great hammerhead they
sampled is well on its way
686
00:37:26,070 --> 00:37:29,530
to becoming one of
the behemoths
Andros is known for.
687
00:37:31,070 --> 00:37:33,970
And at that size,
it's more than big enough
688
00:37:33,970 --> 00:37:35,800
to be a shark killer.
689
00:37:35,800 --> 00:37:37,270
[Tristan] And that's
the muscle sample.
690
00:37:37,270 --> 00:37:39,040
Just putting it in here
for now.
691
00:37:39,870 --> 00:37:42,970
And this is gold dust.
692
00:37:43,040 --> 00:37:46,400
We now need more samples
from great hammerheads here
693
00:37:46,430 --> 00:37:48,170
to really try and understand
694
00:37:48,230 --> 00:37:51,970
if they're specializing
on hunting other sharks.
695
00:37:54,670 --> 00:37:56,040
[narrator]
But Tristan needs more
696
00:37:56,070 --> 00:37:58,170
than just hammerhead samples.
697
00:37:58,170 --> 00:38:00,500
For this comparative analysis
to work,
698
00:38:00,530 --> 00:38:02,070
the team will also need
tissue
699
00:38:02,140 --> 00:38:04,170
of potential hammerhead
prey species
700
00:38:04,170 --> 00:38:05,430
in the area,
701
00:38:05,500 --> 00:38:07,270
including other sharks.
702
00:38:09,800 --> 00:38:11,270
Shark on! Shark on!
703
00:38:11,270 --> 00:38:13,530
[Tristan] The next
big challenge is to go out
704
00:38:13,530 --> 00:38:15,530
and sample the prey species
705
00:38:15,530 --> 00:38:17,700
that these hammerheads
are focusing on.
706
00:38:17,700 --> 00:38:18,970
Look at this five-foot
reef shark.
707
00:38:19,040 --> 00:38:21,630
Perfect prey, I think,
for a 12-foot hammerhead.
708
00:38:21,670 --> 00:38:23,330
We need blacktip sharks,
709
00:38:23,400 --> 00:38:25,170
blacknose,
Caribbean reef sharks,
710
00:38:25,230 --> 00:38:26,900
we need southern stingrays.
711
00:38:26,900 --> 00:38:28,530
We caught a lemon shark now.
712
00:38:28,600 --> 00:38:31,670
That would be a perfect snack
for a hammerhead.
713
00:38:31,700 --> 00:38:34,070
[narrator] Over the course
of the next week,
714
00:38:34,140 --> 00:38:35,630
the team will take
muscle samples
715
00:38:35,670 --> 00:38:37,770
from over 30
individual species
716
00:38:37,800 --> 00:38:40,800
of sharks and rays that
are abundant in the area.
717
00:38:42,270 --> 00:38:44,700
This is absolutely gold.
718
00:38:44,770 --> 00:38:45,900
Data gold.
719
00:38:47,700 --> 00:38:49,600
[narrator] The mission comes
to a close
720
00:38:49,630 --> 00:38:51,430
and all the tissue samples
are sent
721
00:38:51,430 --> 00:38:53,900
to a lab in Florida
for analysis.
722
00:38:57,330 --> 00:38:59,870
-[Tristan] Hey, Phil,
how are you doing?
-[Annie] Hey.
723
00:38:59,900 --> 00:39:01,530
We're on the edge
of our seats trying
724
00:39:01,530 --> 00:39:03,400
to work out
what you're gonna tell us.
725
00:39:03,430 --> 00:39:04,870
[Phil] We just got
the data back
726
00:39:04,900 --> 00:39:06,330
and you are gonna be shocked
727
00:39:06,330 --> 00:39:08,330
-by what we have.
-Ooh.
728
00:39:08,400 --> 00:39:10,230
[Phil] So we were expecting
this hammerhead
729
00:39:10,270 --> 00:39:12,070
to have eaten
a lot of stingrays.
730
00:39:12,140 --> 00:39:14,530
But in fact,
less than a third of its diet
731
00:39:14,530 --> 00:39:16,430
is comprised
of those southern stingrays
732
00:39:16,500 --> 00:39:17,870
-that we sampled.
-[Tristan] Okay.
733
00:39:17,900 --> 00:39:19,230
What is it eating then?
734
00:39:19,270 --> 00:39:21,530
The results are surprising.
735
00:39:21,530 --> 00:39:24,430
This is definitely
a shark-eating hammerhead.
736
00:39:24,500 --> 00:39:26,500
The tissue tells us that 70%
737
00:39:26,530 --> 00:39:28,330
of what this hammerhead
has eaten
738
00:39:28,330 --> 00:39:29,900
-are sharks.
-[Tristan] Wow.
739
00:39:29,900 --> 00:39:32,430
-So a shark-eater?
-[Annie] What?
740
00:39:32,430 --> 00:39:35,530
[dramatic music playing]
741
00:39:37,430 --> 00:39:39,870
[Tristan] What Dr. Phil
has initially found
742
00:39:39,900 --> 00:39:41,330
with these findings,
743
00:39:41,400 --> 00:39:42,630
it's really exciting
744
00:39:42,670 --> 00:39:44,530
and it clearly shows
745
00:39:44,600 --> 00:39:46,600
that that big female shark
746
00:39:46,630 --> 00:39:49,500
that we took
the muscle sample of
747
00:39:49,530 --> 00:39:50,900
is a shark-eater.
748
00:39:53,140 --> 00:39:55,400
-That is actually
really surprising.
-Yeah. I always expected
749
00:39:55,430 --> 00:39:58,040
that the rays would be
like right up there.
750
00:39:59,970 --> 00:40:01,970
[narrator] The diet analysis
has revealed
751
00:40:02,040 --> 00:40:04,170
Andros' great hammerheads
are eating
752
00:40:04,170 --> 00:40:06,070
just about
every shark species
753
00:40:06,140 --> 00:40:09,070
that inhabits
the island's waters.
754
00:40:09,070 --> 00:40:11,270
[man] He's working
on another shark.
755
00:40:11,270 --> 00:40:12,770
[man] Holy [bleep].
756
00:40:12,800 --> 00:40:15,170
[narrator] And not only that,
they're hunting them
757
00:40:15,230 --> 00:40:17,070
in every unique habitat
758
00:40:17,070 --> 00:40:18,600
it has to offer.
759
00:40:20,900 --> 00:40:22,600
[Tristan]
There are juvenile sharks
760
00:40:22,630 --> 00:40:24,400
of many different species
761
00:40:24,430 --> 00:40:26,040
year round in Andros.
762
00:40:26,070 --> 00:40:28,500
And maybe this
allows great hammerheads
763
00:40:28,530 --> 00:40:30,630
to actually be resident
year around
764
00:40:30,670 --> 00:40:31,870
to this system,
765
00:40:31,900 --> 00:40:33,270
which is quite novel
766
00:40:33,270 --> 00:40:34,870
for these migratory species
767
00:40:34,900 --> 00:40:37,270
that typically travel
thousands of miles.
768
00:40:37,330 --> 00:40:39,170
We have a lot more work to do
769
00:40:39,170 --> 00:40:42,230
because would've suspected
a very different result.
770
00:40:42,270 --> 00:40:44,070
We need to look at some
of these other hammerheads
771
00:40:44,140 --> 00:40:46,140
and see if they're following
a similar trend.
772
00:40:49,430 --> 00:40:51,270
[Tristan] We know that
hammerheads across the world
773
00:40:51,330 --> 00:40:54,970
are probably more
likely feeding on stingrays.
774
00:40:54,970 --> 00:40:57,170
They've got
that big hammer-shaped head
775
00:40:57,170 --> 00:41:00,270
that's really adapted
for pinning down rays.
776
00:41:00,330 --> 00:41:01,330
[Skye speaking]
777
00:41:01,400 --> 00:41:02,430
[Tristan]
But we might have found
778
00:41:02,430 --> 00:41:04,140
that these hammerheads
in Andros
779
00:41:04,170 --> 00:41:07,170
are actually keeping sharks
in check.
780
00:41:07,230 --> 00:41:08,270
There has to be something
781
00:41:08,330 --> 00:41:09,900
that keeps those animals
in check,
782
00:41:09,970 --> 00:41:11,170
because if there isn't,
783
00:41:11,170 --> 00:41:12,800
then they may overfeed
784
00:41:12,800 --> 00:41:14,530
on other small fishes
785
00:41:14,530 --> 00:41:16,430
that may impact the health
786
00:41:16,430 --> 00:41:18,270
of the rest of the system.
787
00:41:18,330 --> 00:41:20,630
Hopefully, people will see
these hammerheads
788
00:41:20,670 --> 00:41:23,900
and understand that
they're truly the guardian
789
00:41:23,970 --> 00:41:25,798
of these habitats
and ecosystems.
53468
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