All language subtitles for The.Proof.Is.Out.There.UnXplained.Edition.S01E05.1080p.WEB.h264-EDITH_track3_[eng]

- [Tony] Eerie hums, haunting
drones, piercing buzzing...

[buzzing]

Strange sounds are
sweeping the globe,

but who or what are behind

these disturbing noises
tormenting mankind?

- What is that sound?
[humming]

It's driving me [bleep] crazy.

- From the mountains to
the ocean and even Mars...

Are these eerie signals a
message from an alien race?

- It was a civilization
that once lived there

and is now extinct?

- [Tony] What is causing
a reverberating hum

in Southern California?

- [Tony] Could this be
the sound of Bigfoot?

[creature growling]

- That was probably

the most unique Bigfoot
encounter I've ever had.

- [Tony] On this special episode

of "The Proof Is Out There,
Unexplained Edition,"

our team of top
experts investigates

evidence of bizarre sounds
from around the world.

[creature calling]
- What is that noise, bro?

- Then we'll pass a verdict.

The Proof starts now.

[dramatic music]

Good evening and welcome to
"The Proof Is Out There".

Hollywood can produce some
impressive sound effects,

but what happens

when a real-life massive
sound straight out

of an explosive blockbuster
echoes throughout Los Angeles?

Just look and listen.

January 23rd, 2021, Los
Angeles, California.

It's a chilly, rainy day when
warehouse worker Eric Reyes

is startled by a strange
sound coming from the sky.

He grabs his cell
phone and records this.

[humming]

The typical sounds of
rainfall are echoed

by a distant, other worldly hum.

The sound is
constantly reverberated

throughout the whole community.

[humming]

- At first I was in
denial and I was like,

I don't wanna hear this sound.

But it kept on going, so
I went outside my patio.

I started filming the sound.
I was scared a little bit.

That really freaked me
out. I did some research.

Some people would say something
hiding behind the clouds.

[humming]
- And what's truly odd

is that similar sounds were
reported in other parts

of Southern California
around that time.

Author Jason Martel
explores the theory

that sounds like these,

as well as many others
heard around the world,

could be entering our
atmosphere from space.

- One of the possible theories

of what we're hearing
is plasma wave.

Plasma is the fourth state
of matter, very similar

to gas, but all the
particles are ionized.

Occasionally the sun emits
coronal mass ejections,

which are large
explosions of plasma

from the magnetic field
of the sun's corona.

- [Tony] According to NASA,
these coronal mass ejections,

or CMEs, can create currents
in Earth's magnetic fields,

altering frequencies
that can be heard

as a strange cacophony of noise.

[humming]
And while this theory

has become increasingly popular,

others think that these
sounds could be part

of a pattern specific
to Southern California.

- Many have theorized

that these could also be
related to the San Diego booms.

[booming]

They were recorded in March,
June, and December of 2021,

the same year as the
Los Angeles sounds.

[booming]
- Those mysterious

San Diego booms were never

explained, and while
San Diego is right next

to a naval base on
nearby Coronado Island,

officials for the base
denied any involvement.

However, some still speculate
that it could be part

of an experimental program
involving sonic weapons,

weapons like the LRAD, or
Low Range Acoustic Device,

which is being used around

the world for crowd
control and dispersal.

- Many have said that the Navy

has acquired armed
merchant ships

and have outfitted them with
modular weapons systems.

Is it possible that the sounds
we're hearing are coming

from these new naval
capabilities right off the coast

of Los Angeles?

- If the Navy were secretly
arming merchant ships,

LA seems like a pretty
good place to do it.

The Port of LA is the busiest
in the Western Hemisphere

and moves nearly $300 billion
worth of cargo every year.

But are some of these ships
being secretly retrofitted

for the future of naval warfare?

We turn it to our
experts to investigate.

- The federal government
constantly monitors

coronal mass ejections and
their impact across the world.

Taking a look at the
Planetary K Index,

which measures overall
electromagnetic waves out

in space, we see that
this was not related

to a solar storm or
electromagnetic waves.

- [Tony] With the outer
space theory neutralized,

we turn to see if these
sounds are even real

in the first place.
- In this recording,

there was no indication
that it had been assembled

or layered or put together
from other sources.

It appears to be authentic.

The area in which the
recording was made does

have some industrial operation,

so I compared the
recording to some sounds

of manufacturing equipment.

[rattling]

So this manufacturing
system has tonal qualities,

so frequencies that we can
observe in the spectrogram.

It also has a repetitive sound,

but the overall effect is
similar to what we heard

in the example recording.

[rattling]

[humming]

So it is conceivable
that the sound might be

from some sort of
industrial source.

- [Tony] Of course,
these two sounds

are not identical, but again,

it's the tonal qualities in
the spectrogram that Maher

is focusing on.

- Some of the other
characteristics

are a little bit different,

and so it's hard to
attribute it exactly

to a particular
manufacturing process.

But it's certainly
plausible that that could be

from an industrial source.

- Our verdict?

We're calling this an
unidentified industrial noise.

Between this and the still
unexplained San Diego booms,

you may wanna pack some
earplugs the next time

you're headed to
Southern California.

The Mariana Trench
of the Pacific Ocean

is nearly 36,000 feet deep.

To put that in perspective,

you could pick up Mount
Everest and drop it

in the trench, and the
mountain would still be

a mile below the
water's surface.

Due to such enormous depths,

the trench still has not
been widely explored.

So when a monstrous
sound was detected there,

it was a mystery for us all.

It's November 16, 2014.

Dave Mellinger and his team
of marine researchers drop

a passive acoustic ocean
glider into the deepest part

of the Pacific Ocean,
the Mariana Trench.

There, they record this.

[humming]

The five-part sounds,
which last no longer

than 3.5 seconds each,

include deep moans at
frequencies as low as 30 hertz,

low rumbles,
high-pitched screeching,

and a strangely metallic
finale that reaches frequencies

as high as 8,000 hertz.

The noises return. Let's
turn up the volume.

[humming]

A weird auditory mixture
of the biological

and the mechanical,
leading to confusion

over the likely cause.

- We ran across this very
strange, unusual sound,

which we later called the
Western Pacific Biotwang.

We started hearing
it and we're like,

what the heck is that sound?

But we really didn't
know what this sound was.

We just had not heard
this kind of thing before.

[humming]

- [Tony] Journalist
Erin McCarthy says

the Biotwang emanates
from a place so remote,

it might as well
be another planet.

- Up until recently,

more people had
been to the moon.

So you're looking at
an area of the planet

that is basically
like an alien world.

I think it's fair to
say that this sound

is fairly alien-like,
which has led some people

to speculate that aliens
have set up underwater bases

in the Mariana Trench
because it's more like

their world than it is ours.

- [Tony] But that isn't the
only possible explanation

for the mechanical sound.

- A potential
explanation is some kind

of top secret
military transmission.

- The US Navy

has conducted underwater
experiments for decades.

Some of the most famous include

the Sealab underwater habitats.

There was an underwater
nuclear bomb test.

And more recently, they've
started testing bullets

that can shoot from underwater.

Until recently, scientists
assumed that the murky depths

of the Mariana
Trench were quiet.

But research teams have
since discovered that it

is actually abuzz with sound.

A NOAA research oceanographer
has even said that there

is almost constant
noise from both natural

and man-made sources.

So the question remains,

what created these
mysterious sounds?

Our experts go on a deep dive.

First, could the sound
be seismic activity?

The Mariana Trench is a
hot bed of earthquakes thought

to be due to the high pressure
at the bottom of the trench.

- There's hundreds of thousands

of earthquakes
happening each year.

It's one of the more
common acoustic signals

we have in our oceans.

[humming]

This is super low frequency

hand it's this
continuous rumble,

which is way different
than the Biotwang.

[humming]

[humming]

We could say definitively
it's not caused

by seismic activity.

- [Tony] Next, Dr. Shea
Steingass focuses on the bio

in the Biotwang.

She thinks it could be
an animal, but what?

- In recent years,

there have been sightings
or biopsies of whales

that we thought were extinct.

And in fact, they weren't.

We're only getting small
glimpses of what's going

on in places like
the Mariana Trench.

- [Tony] Steingass believes
the Biotwang was made

by one such species, not
one believed extinct,

but one that's rarely seen.

- The researchers
that study these types

of animals were able to
determine that this is probably

a Bryde's whale.

They spend a lot of
time at the surface,

but they're very elusive and
we don't know a lot about them.

[humming]

- [Tony] But hang on, as
Dr. Steingass mentioned,

the Bryde's whale spends
the majority of its time

in the top 10 meters
of the water column,

not the bowels of the
planet's deepest ocean trench.

And there's another problem
here with the persistence

of the sound.

- These whales primarily
use these sounds

for mating, which happens
mostly in late winter.

But this sound, they've
recorded it all year round

at this location.

- Okay, so the
ocean scientists say

the Bryde's whale theory is
possible, but as we just saw,

it doesn't really
fit all the facts.

The sound is similar
enough to other whale calls

to rule out anything mechanical.

But our verdict?

This is an unidentified
ocean animal,

quite possibly a species
we've never seen before.

- Strange sounds terrorizing
entire communities

seem to be a growing trend.

Several years ago,
residents of a small suburb

in Oregon were tortured

by a still unexplained
whistle they claimed

was driving them insane.

In our next story, a new
sound is disturbing the peace,

only this time in the outer
boroughs of the Big Apple.

Brooklyn, New York,
November 2022.

Mo Hussein is walking home
at night when he hears

a mysterious sound echoing
through his neighborhood

of Fort Greene.

Using his camera
phone, he records this.

[humming]
- What is that sound?

- [Tony] And according to
Mo, this noise has been going

on and on, haunting
residents for over a year.

- It's driving me [bleep] crazy.

- It's the type of sound
that kind of drills

into your head slowly,
hour after hour,

until finally you kind
of jump up from your desk

and you say, oh my God,
what is that sound?

It made it difficult to sleep

and it definitely
caused headaches.

- [Tony] Out of desperation,
Mo and his neighbors called

the city, but the sound would
mysteriously turn off any time

officials showed
up to investigate.

- The timing of the
occurrence of the hum led

a lot of people to believe
that it was some sort

of construction equipment

that could hopefully
be turned off.

- [Tony] But with
no clear answers

from any city representatives,

another theory emerged based

on the hum's
potential frequency.

- There's a phenomenon,
the worldwide hum,

that can be heard by certain
people all over the world.

It's been reported

to cause symptoms including
nausea, headaches, dizziness...

- [Tony] Some people theorize
that the worldwide hum

is tied to underground
gas pipelines.

This map created by hum sufferer

and mechanical engineer
Steve Colehouse shows

the overlapping
proximity of hum reports

and pipeline locations.

But while the Brooklyn
pipeline has been in the works,

it is far from finished.

So Grundhauser explores
a more frightful theory,

one involving sonic weapons.
- In 2016 in Havana,

Cuba, members of the U.S.

Embassy staff woke up in
the middle of the night

to a loud piercing sound

that caused dizziness,
vertigo, and nausea.

- [Tony] Although Cuba
denied any responsibility

for this sound and its effects,

later dubbed Havana Syndrome,

a recent study claims to show
brain abnormalities in all

the people who heard this noise,

leading many to believe
it was a sonic weapon.

- Similar symptoms
have been reported

by hundreds, some have even
said thousands, of U.S. spies

and diplomats all
over the world.

[humming]

- This strange hum hasn't

been Brooklyn's
only audio oddity.

Several years ago, residents
of Brooklyn Heights started to

hear a mysterious high-pitched
chirping noise around

Cadman Plaza Park.

It turned out that was coming

from a state-of-the-art
pest-repelling sound machine

sitting out on
someone's balcony.

Could something so simple be
what's plaguing Fort Greene?

We'll let our experts sound off.

- The Havana sound has
a very high frequency,

but the recording in Brooklyn,
the lower frequency of this

is nothing like the Havana tone.

- [Tony] Some experts concluded
that the Havana sound,

at least that one
recording of it,

was just local crickets anyway.

But that still doesn't
explain what could be behind

this infuriating
hum in Brooklyn.

Maher thinks he has an idea.

- It's reminiscent
of what is referred

to as a Helmholtz resonance,

and this is the resonance
that you hear if you blow

over the top of a
pop bottle or a jug.

[bottle humming]

With this sound that
is heard in Brooklyn,

the amplitude tends
to vary up and down,

which to me is an indication
that this might be

a resonance effect, like wind
blowing through a railing

or a building that might cause

this continuous
resonant quality sound.

[humming]

- [Tony] Solid structures
like steel railings

or metal bars contain
molecules that vibrate

at a frequency specific
to their makeup.

And when hit by something
like high winds,

the Helmholtz
resonance can kick in.

- You may amplify
existing small vibrations,

turning them into larger ones.

The Brooklyn hum can just
be blamed on some sort

of wind tunnel effect
towards structures

that can wiggle back
and forth at just

the right frequency to
create this annoying sound.

- It's driving me [bleep] crazy.

- While we agree
with our experts

that the Brooklyn hum
is most likely a product

of resonance
created by the wind,

we still don't know exactly
which structure the sound

is coming from.

Our verdict, partially
unexplained sound resonance.

Meanwhile, the people of
Fort Greene have started

the petition to stop
the mysterious noise.

They hope making noise

of their own will yield some
well-earned peace and quiet.

- If you go anywhere
in the world

and ask someone what
Bigfoot looks like,

you'd get similar
answers most every time.

But what if you asked
what Bigfoot sounds like,

this recording
might be the answer.

This story goes all the way
back to California in 1971.

Al Berry and his friend
Ron Morehead have come

to the Sierra Nevada mountains

to investigate mysterious
noises reported

by a bewildered
group of hunters.

What their microphone
picks up becomes the first

of a series of recordings now
known as the Sierra Sounds.

[growling]

The recordings capture a series

of guttural grunts, howls,

and growls thought to be
made by an alleged Bigfoot.

- The very first sounds
were very aggressive.

Could be considered
very scary, but again,

they weren't coming after us.

So we don't know the intent,
we don't know the agenda,

we don't know what it was.

- [Tony] Ron claims that
later he even interacted

with these mysterious creatures
before getting his first

glimpse of one.

[shouting]

I was responding back to
them and that was probably

the most unique Bigfoot
encounter I've ever had.

Field researcher Cliff
Barackman says the Sierra Sounds

are the gold standard of
Bigfoot vocalizations.

I've spoken to several
witnesses that have reported

this kind of sound
that says something

about the authenticity of
not only their sighting,

but these sounds.

- The recordings range
from guttural growls...

[growling]
To wild woofs.

[shouting]
To something

that almost sounds
like language.

[muttering]

- There's a retired
crypto-linguist

from the U.S. Navy.

He's realized that there
are phonemic patterns

that repeat in the sounds.

Those are words.

Sasquatches might be
talking to one another.

- Now, here's the thing
about Bigfoot sounds.

They're easy to fake and
easier to misidentify.

We've heard examples of both.

So let's dial things
down a bit and check

in with our experts.

- The sound is really loud,

and it's of quite a low
pitch and frequency,

so it travels far.

So it's likely that it
came from a large animal.

- [Tony] Next, we
bring the recordings

to soundscape ecologist
Dr. Ben Gottesman.

- So here we have three phrases.

- [Tony] First, Gottesman
examines the guttural sound.

[growling]

Next, the whooping.

- The second has these
low to high up-sweep.

[shouting]

[Gottesman shouting]
- And finally, the chatter.

[muttering]

- And those almost
sound like words.

- [Tony] The question,
could those come

from any known large
animals native to the area?

- We're now going to listen to
the sound of an elk bugling.

[elk bugling]

[growling]

The sound of an elk bugling
has much longer tonal signals.

This is not a match.

Now let's listen to the
sounds of a black bear.

[bear growling]

[growling]

[shouting]

While the frequency
range is similar,

the shape and complexity
of the signals

are totally different.

The Sierra sounds are on a
much more advanced level.

- [Tony] Gottesman also
rules out an assortment

of smaller creatures since
they lacked lung capacity

to create calls
that loud and low.

Gottesman also notices that
whatever made these sounds

has an enormous vocal range.

- If this is produced
by a single creature,

there is just a remarkable
acoustic diversity

that this alleged species has.

If they are an animal, I
can't confidently point

to one, especially one that's
native to North America.

- [Tony] So could the
sounds have been made

by other humans?

- I do not believe
it is possible

for this to be human because
it has a great variance

of going to very high pitch down

to a very low growl
all within seconds.

[animal growling]

We're not capable

of that without blowing
out our vocal cords.

My conclusion is that
they are real recordings

of Bigfoot and I base
that on knowing how remote

that location was and the
impossibility for another human

or other thing to have
made those sounds.

- The Sierra sounds
recordings are legitimate.

Scientists and even some
linguists point to them

as evidence multiple
Bigfoots were communicating

with each other, as well
as with Morehead and Berry.

Our verdict here?
Unidentified animal sounds.

Regardless of what made them,

the Bigfoot legend
continues to speak to us.

The big question is,
are we really listening?

With over 364 million
acres, Alaska,

known as the last
frontier state,

has no shortage of
mysterious phenomena.

Something that the hikers

in our next story
experienced firsthand.

It's April 2019 in
Anchorage, Alaska.

Two hikers are climbing
the scenic O'Malley Peak

when something truly bizarre
happens and they start filming.

[humming]

As one of the hikers
reaches into the sky,

a strange buzzing
sound fills the air.

She appears to be able
to manipulate the sound

by squeezing the air and
placing her hand on her head.

She winces as the
sound continues,

as if she can feel
the disturbance

coursing through her.

- I don't like how it feels.
I'm putting my hat back on.

- [Tony] Journalist
Erin McCarthy says

this could be related to
a mysterious phenomenon

that some believe has
long plagued the region.

- Some have speculated
that perhaps the noise

has something to do with
the Alaska Triangle,

which is an area of Alaska
that stretches from Juneau

to Anchorage to Utqiagvik.

And some of the things that
are said to occur there

are energy vortexes and
bizarre magnetic activities.

[humming]

- [Tony] McCarthy says a number

of unexplained
incidents have occurred

in this geographic area
that ended in tragedy.

- In 1950, a U.S. military plane

went down in the Alaska Triangle

and 44 people on board
disappeared without a trace.

Then in October 1972,

a plane carrying two
congressmen went down

in the Alaska Triangle
and no trace of that plane

has ever been found either.

- [Tony] But McCarthy says

there's an even
more nefarious idea

of what could be causing this
strange mountaintop anomaly.

- Another theory is
that this maybe is 5G.

5G is a wireless
network that can be used

to transmit information
over radio waves.

Some believe that 5G
caused mass bird die-offs,

harm that has come to trees,

and some even believe
that it can cause cancer

or other health issues.

[humming]

- The number of disappearances

within the Alaska Triangle
is three times higher

than the national average.

Were our hikers experiencing
the mysterious force

that's snatching
planes from the sky?

Or perhaps they were
caught in the crossfire

of allegedly dangerous
5G radio waves.

With all these mounting
questions buzzing around,

my head is starting to buzz too.

Let's tune in to what
our experts are saying.

- Given the extreme
weather in Alaska,

you can actually get several
inches of snow per hour.

So if there is a plane crash,

it's possible within
a matter of hours

that it's completely
covered by snow.

Something that goes
missing in Alaska

is gonna be extremely
difficult to find.

[humming]

- [Tony] So could our
hikers have been intercepted

by supposedly harmful 5G waves?

- 5G does not have any
visible or auditory effects,

simply because it's the
wrong wavelength, frequency,

and amount of energy.

If they were able to
do any sort of harm,

then so can visible
light colors,

which contain
significantly more energy.

- [Tony] So if it's
not 5G and it's not

the Alaska Triangle, what's
really going on here?

- I actually fear for the safety

of the individual in the video,

because what we're seeing is a

relatively common occurrence
before a lightning strike.

[lightning crashing]

- [Tony] Hernandez explains

that cold weather
conditions like those seen

in the video can cause a
buildup of electric energy.

- It's possible that she
is somehow interacting

with the electric field

in the area and creating
a static electricity.

A lot of times when
we feel static charge,

that usually means that

lightning is very
close to striking.

- [Tony] Lightning occurs
when electrical charges

in the air and on the ground
reach a critical imbalance.

There's a moment
before it strikes

when static electricity

is building in the
air near the ground.

The rapid transfer of energy
restores the equilibrium.

And Szydagis says this buildup
of energy can create a sound.

- That buzzing
sound can be created

by electricity, since sound

is simply caused by
movement of atoms.

And if you have electrons
within atoms moving around,

the atoms as a whole
will be moving around,

and you actually
can create sound,

which is simply
changes in air density.

[humming]

- Our verdict?

This was simply a buildup
of static electricity,

and a dangerous one at that.

But thankfully, our hikers
made it out alive and well.

Alaska may be full of mysteries,

but this strange sound
is no longer one of them.

but this strange sound
is no longer one of them.

Generally, when people
think of ocean sounds,

they think of
something relaxing.

The marine noises in our
next story are anything but.

Let's see why an entire
commercial fishing team

was shaken by what they heard
echoing across the waves.

August 2021, the
North Atlantic Ocean.

A Massachusetts fishing
vessel makes its way

through the night when
the crew begins to hear

an eerie noise.

One of the fishermen pulls out
his camera and records this.

- [Tony] The camera pans
across the black ocean.

- [Tony] Then the haunting
screams of something off

in the distance.

[screaming]

[screaming]

- When the video
hit social media,

the first obvious
theory was a whale song.

But many questioned if such
sounds could ever be heard

this clearly above the water?

- [Tony] Eric Grunhauser
says others speculated

that it was the cry of
the legendary sirens

of Greek myth, whose
song could seduce sailors

to their doom.

- With only 5% of our oceans

having been fully explored,

is it possible that
sirens of Greek myth

are still out there on some
lonely craggy rock waiting

to be discovered?

- [Tony] Another theory posits

that we might be hearing the
sound of a haunted ghost ship.

And this isn't just
a fisherman's tale.

- Ghost ships are
a popular legend,

versions of which you can
find all over the world.

- [Tony] In October 1931,

a 230-foot cargo ship called

the SS Baychimo became
trapped in ice off Alaska.

Twenty-two men were rescued,

but 15 volunteered
to stay behind,

hoping it would break free
and they could save it.

These brave men were never seen
again, but the Baychimo was.

- The workers thought
that the Baychimo

had sunk, but a few weeks later,

some hunters actually spotted
the Baychimo floating off

the coast of Skull Cliff.

Some six months later,

a dog sled crew actually saw
the Baychimo in the sea ice.

- [Tony] The abandoned ship
had broken free of the ice.

It stayed afloat for decades,

scaring the locals
wherever it went.

- The ship was last
seen in 1969 when it

was spotted by some
coastal residents.

Could the sound in
this video actually be

the haunted sounds

of the ghost ship Baychimo
floating somewhere nearby?

- When it comes to ghost
ships, nobody beats Japan.

For the past several years,

hundreds of boats filled
with rotting corpses

have mysteriously washed up
on western Japanese shores.

Spooky, right?

Items found on board
led investigators

to believe these boats
belonged to defectors

or desperate fishermen
from North Korea,

all of whom lacked the
proper supplies to survive.

Let's see what our experts
think about this oceanic oddity.

- Even a trained
opera singer would

have trouble making
a frequency this high

from the soprano range.

[screaming]
- Oh my God.

- [Tony] So he decides
to test the sound

against something
more mechanical,

exploring the possibility

that perhaps they were
hearing another ship

or even their own.

- Comparing the
sound to examples

of hydraulic
machinery on a ship,

we have some similar
frequency characteristics

and some plausible
connection between the two.

[humming]

[screaming]

But we don't see an example
that exactly matches,

so we can't really
guarantee that the sound

in the example recording is
from a mechanical source.

- [Tony] But before we
say it's a mythical siren,

- Oh my God.
- Shea Steingass brings

the conversation back to whales,

but not in a way
you might expect.

- Alaska is known

as a biodiversity
hotspot for whales.

[whale calling]

What I think we're hearing
here has only been documented

in a couple dozen individuals

of humpback whales,
specifically in Alaska.

And I think this
might be an example

of collaborative feeding.

- [Tony] Collaborative feeding

is when whales use
vocalizations and bubbles

from their blowholes to trap
and stun fish for feeding.

But how can this be
heard above water?

- The frequency

of sound doesn't actually
change between water and air.

So we can hear noises and they
would sound the same to us

on land or on a boat as
they do in the water.

- [Tony] To double
check this theory,

we had Rob Maher run
humpback whale sounds

through his spectrogram.

And sure enough...

[whales calling]

- The recordings with
a hydrophone underwater

of the humpback whale have
very consistent frequency

with what's observed in
the example recording.

[whales calling]

And characteristics of the
sound seem to match up.

- Our verdict?
Our experts agree.

What we are hearing
is a very rare example

of humpback whale vocalizations.

But that doesn't mean there
aren't any ghost ships

or sirens out there.

So make sure you're prepared
to batten down those hatches.

- It's often said, if you
have your ear to the ground,

you'll hear everything that
people are saying and doing.

But as you'll hear
in our next piece,

if you do that on Mars,

you'll be confounded with
a cacophony of sounds

and mystified by their origins.

Some people say that the
origin of this next sound,

recorded by NASA, was from
a Martian civilization.

We say it's something you've
got to hear to believe.

March 6th, 2019, around
2 PM local Mars time.

The 98th Martian day
or Sol of the mission

for NASA's InSight lander.

The spacecraft is
surveying its workspace.

A camera on its
robotic arm is moving

and snapping pictures
after placing a seismometer

on the surface to
study Mars quakes.

While it finds many,
it also detects this.

First, an eerie hollow noise,

followed by a series
of dinks and donks.

[humming]

Then a howl, right out of
a science fiction film.

[humming]

What could be making
these strange sounds?

- NASA's research with Mars
found overwhelming evidence

that Mars was a wet, green
planet, very similar to Earth.

It had water, breathable air.

Many people think there
was a civilization

that once lived there
and is now extinct.

So perhaps we're
hearing some type

of signals being sent out from
Mars from the distant past.

Back in 1901,
Nikola Tesla claims

that he had received
radio signals from Mars.

So possibly this is the
remnant of that communication

that we're hearing now.

[humming]

- [Tony] Another
possibility, and go with us

for a minute, is that
the sounds are emanating

from within some large
underground structure.

- Some researchers
believe that sound played

a major role in the
architecture and the building

of the pyramids.

- [Tony] A passage
was discovered inside

the Great Pyramid of Giza,

thought by some to function

as an acoustic resonance tube,

meaning it amplified
sound vibrations

from the air outside,

generating infrasounds that some

claim can induce
otherworldly sensations.

Could this have been
a deliberate part

of the pyramids' design?

And could an alien race

have constructed
something similar on Mars?

- There is no reason
to think there couldn't

have been an advanced
culture on the planet

that could produce
structures that were similar.

And what we're hearing with
these odd sounds on Mars

is the remnants
of some structure

that's been buried
beneath the surface.

[humming]

- The nature of
Mars's atmosphere

means sound operates
differently there.

In fact, sound travels 100
meters per second slower

on that planet than on Earth.

Additionally, there are two
speeds of sound on Mars,

one for high-pitched sounds
and one for low-pitched sounds.

Let's see if our experts
can pitch in and tell us

what we're hearing here.

- I found the
recording in question

on the NASA website,

so I believe this is
a genuine recording.

- [Tony] Ed Primeau proceeds
to compare the sound

to the first potential
match, Mars quakes,

which are frequent
and well-documented.

- The frequency
range on the quake

is below 100 hertz
across the board.

The recording in question
goes up much higher

than that, about
400 to 1,000 hertz.

[humming]

So I can safely rule out
this sound being a quake.

- [Tony] Next,
Matthew Szydagis digs

into the extinct
civilization signal theory.

- Some people have hypothesized

that this is some sort
of alien we are hearing.

However, Mars has not been

what we would consider
habitable for billions of years.

The Martian atmosphere
is extremely thin,

and it doesn't have
significant quantities of atoms

or molecules necessary for life.

For example, oxygen.

Even if we consider life forms

that don't require oxygen,
such as anaerobic bacteria,

an advanced intelligent
civilization existing on Mars

is very unlikely.

- [Tony] Szydagis
says this also reduces

the possibility of
the sounds emanating

from an ancient structure.

It would just be too
old to survive till now.

- It is possible there
are structures buried

under the surface of Mars,
especially as it's a desert.

But this just seems
very far-fetched to me,

and I think this
is something else.

[humming]

- So what are we hearing
on Mars' surface here?

- Because of the high
technology of the seismometer,

that's what we're
actually picking up here.

The vibration of the arm
moving, wind blowing,

the sand around, the vibration

of those particles
pushing across the soil.

That's what you're
hearing in this recording.

- Our verdict?

Wind and the movement of
the spacecraft itself.

While this NASA mission
has provided great data

for scientists and even greater
fodder for a ufologists,

it is expected to
cease functioning

by the end of the year.

But not us.

We'll keep an eye and an
ear and a seismometer out

for any more
Martian discoveries.

From the lifeless
deserts on Mars

to the skies above California

and into the uncharted
trenches of the ocean,

we've investigated the
echoes of the unexplained,

some rooted in nature,
others defying all logic.

But one thing is certain,
the more we uncover,

the more questions we face.

Thank you for watching
the special edition

of "The Proof Is Out There".

Please send us any video,

images or sound that you
think we should investigate,

and remember to keep
those cameras rolling.

[upbeat music]