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In this series,
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00:00:05,680 --> 00:00:09,200
I have traveled the length and
breadth of the Great Barrier Reef...
3
00:00:13,560 --> 00:00:16,800
...and used the latest techniques
to watch its wildlife.
4
00:00:26,360 --> 00:00:30,000
But the reef has
one more story to tell.
5
00:00:32,800 --> 00:00:35,479
The residents of this marine paradise
6
00:00:35,480 --> 00:00:39,520
have seen their habitat change
rapidly within the last few decades.
7
00:00:41,160 --> 00:00:43,600
And time is running out for them.
8
00:00:48,440 --> 00:00:51,719
The Barrier Reef is facing
one of the most serious challenges
9
00:00:51,720 --> 00:00:54,159
to its continued existence -
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00:00:54,160 --> 00:00:56,000
the effect of human beings.
11
00:00:57,840 --> 00:00:59,600
But there is hope.
12
00:01:01,480 --> 00:01:04,479
This time, our research vessel,
the Alucia,
13
00:01:04,480 --> 00:01:07,199
will be taking me to meet
teams of scientists
14
00:01:07,200 --> 00:01:10,600
who are developing new ways
to try and save it.
15
00:01:12,040 --> 00:01:14,639
And I'll be going to
its deepest parts,
16
00:01:14,640 --> 00:01:16,679
where new discoveries are being made
17
00:01:16,680 --> 00:01:19,559
that might hold clues
to its survival.
18
00:01:19,560 --> 00:01:22,679
Nobody has ever dived
as deep as this before
19
00:01:22,680 --> 00:01:24,200
on the Great Barrier Reef.
20
00:01:26,280 --> 00:01:31,119
This is one of the greatest and most
important ecosystems on the planet -
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00:01:31,120 --> 00:01:34,040
and what happens here affects us all.
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00:01:35,440 --> 00:01:39,080
So, what does the future hold
for this complex wonder?
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00:01:51,320 --> 00:01:54,119
I'm traveling along
Australia's north east coast
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00:01:54,120 --> 00:01:55,919
to look at one of the greatest
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00:01:55,920 --> 00:01:59,559
and most splendid natural treasures
that the world possesses -
26
00:01:59,560 --> 00:02:02,439
a chain of tropical islands
and coral reefs
27
00:02:02,440 --> 00:02:05,640
that lies between the coast
and the open ocean.
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00:02:12,360 --> 00:02:15,400
I will never forget
the first time I came here.
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00:02:18,880 --> 00:02:20,879
YOUNGER DAVID: 'And what
a world this was -
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00:02:20,880 --> 00:02:23,759
'beneath me lay an endless
landscape of coral,
31
00:02:23,760 --> 00:02:26,760
'of every conceivable
color and shape.'
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00:02:38,560 --> 00:02:42,800
It was unimaginable then to think
that we might ever lose the reef.
33
00:02:47,200 --> 00:02:51,120
But now, I've returned, and
I can see that the reef is changing.
34
00:02:54,640 --> 00:02:58,760
In the last 30 years, almost
half the coral has disappeared.
35
00:03:02,480 --> 00:03:06,600
The greatest concern now is that
we might lose the reef altogether.
36
00:03:17,120 --> 00:03:20,199
Parts of the Great Barrier Reef
still remain a mystery.
37
00:03:20,200 --> 00:03:22,839
Its immense size and remote depths
38
00:03:22,840 --> 00:03:25,600
make it extremely
difficult to explore.
39
00:03:29,560 --> 00:03:32,959
But today, exciting new technology
has made it possible
40
00:03:32,960 --> 00:03:37,279
to survey the entire reef
from top to bottom.
41
00:03:37,280 --> 00:03:40,119
And that is revealing
extraordinary things
42
00:03:40,120 --> 00:03:43,600
about the way in which the reef
itself has evolved over time.
43
00:03:45,680 --> 00:03:47,839
By looking into the reef's past,
44
00:03:47,840 --> 00:03:50,560
we may discover something
about its future.
45
00:03:52,280 --> 00:03:55,960
So, I'm meeting marine geologist
Dr Robin Beaman.
46
00:03:58,560 --> 00:04:00,519
'He is on board the Alucia
47
00:04:00,520 --> 00:04:03,440
'and shows me some of his
remarkable discoveries.'
48
00:04:04,920 --> 00:04:08,039
This is a depth model of
the Great Barrier Reef -
49
00:04:08,040 --> 00:04:10,159
of the entire
Great Barrier Reef.
50
00:04:10,160 --> 00:04:12,599
And there's a whole lot
of different tools we use,
51
00:04:12,600 --> 00:04:14,839
the main one being
multibeam echosounders,
52
00:04:14,840 --> 00:04:17,479
so it gives you
a scan of the seafloor
53
00:04:17,480 --> 00:04:21,959
and we can actually map great
areas of the continental shelf.
54
00:04:21,960 --> 00:04:24,399
This white part is land?
55
00:04:24,400 --> 00:04:25,519
That's right.
56
00:04:25,520 --> 00:04:30,079
So, everything that's colored
rainbow colors is under water.
57
00:04:30,080 --> 00:04:33,919
'By combining computer modeling
and deep sea surveying,
58
00:04:33,920 --> 00:04:36,159
'Beaman has discovered new evidence
59
00:04:36,160 --> 00:04:39,520
'that the reef has already
experienced great changes.'
60
00:04:42,160 --> 00:04:44,279
As a scientist -
as geological scientists -
61
00:04:44,280 --> 00:04:46,519
we're trying to understand
how the Great Barrier Reef
62
00:04:46,520 --> 00:04:48,599
has responded to changes in the past
63
00:04:48,600 --> 00:04:51,639
and there are clues there as to what
the Great Barrier Reef has done,
64
00:04:51,640 --> 00:04:55,359
so if I zoom back,
you can see, geologically,
65
00:04:55,360 --> 00:04:57,840
it's gone through some
dramatic changes.
66
00:05:01,360 --> 00:05:05,239
Beaman's scans showed
traces of an ancient reef
67
00:05:05,240 --> 00:05:08,239
that thrived over the last
half million years
68
00:05:08,240 --> 00:05:11,720
and is now hidden along the edge
of this great drop-off.
69
00:05:14,160 --> 00:05:18,199
This earlier reef existed
long before the one we know today.
70
00:05:18,200 --> 00:05:20,839
It lay up to 70 meters deep
71
00:05:20,840 --> 00:05:24,520
and stretched nearly unbroken
for more than 500 miles.
72
00:05:27,480 --> 00:05:30,960
It's been described as
the world's largest fossil.
73
00:05:33,120 --> 00:05:36,279
This is what the older
Great Barrier Reef looked like.
74
00:05:36,280 --> 00:05:38,119
And we call these "drowned reefs" -
75
00:05:38,120 --> 00:05:41,159
they're drowned in the sense that
the water over them is so deep
76
00:05:41,160 --> 00:05:42,960
that the reef no longer grows.
77
00:05:45,120 --> 00:05:48,279
These ancient reefs were drowned
by dramatic climate changes
78
00:05:48,280 --> 00:05:50,400
that caused sea levels to rise.
79
00:05:52,120 --> 00:05:55,200
This last happened less
than 14,000 years ago.
80
00:05:56,960 --> 00:06:00,079
So, water released from
the melting icecaps
81
00:06:00,080 --> 00:06:03,519
is going to start flooding
across here, is it? That's right.
82
00:06:03,520 --> 00:06:06,399
The sea level was high enough
to actually inundate
83
00:06:06,400 --> 00:06:08,799
and cover these old limestone hills
84
00:06:08,800 --> 00:06:12,039
and created the Great Barrier Reef
that we know today.
85
00:06:12,040 --> 00:06:14,999
So, the changes that
we're seeing going on now
86
00:06:15,000 --> 00:06:18,119
are nothing new, in terms of change.
87
00:06:18,120 --> 00:06:21,399
I mean, the Barrier Reef
has always been changing.
88
00:06:21,400 --> 00:06:22,999
We do find it's quite robust.
89
00:06:23,000 --> 00:06:24,879
It has actually reformed,
90
00:06:24,880 --> 00:06:30,120
despite these catastrophic changes
that have occurred.
91
00:06:31,400 --> 00:06:36,279
It's been exposed and flooded
at least four times that we know of.
92
00:06:36,280 --> 00:06:38,080
To us, it's astounding.
93
00:06:41,520 --> 00:06:44,959
This new insight into
the ancient history of the reef
94
00:06:44,960 --> 00:06:48,480
shows that, given enough time,
it can regenerate.
95
00:06:53,080 --> 00:06:56,359
It seems that if seawater
is clear and warm,
96
00:06:56,360 --> 00:06:58,999
simple organisms will
eventually evolve
97
00:06:59,000 --> 00:07:01,639
that can build limestone
homes to protect themselves
98
00:07:01,640 --> 00:07:03,480
from the waves and their enemies.
99
00:07:05,840 --> 00:07:10,279
But most of these events started long
before human beings appeared on Earth
100
00:07:10,280 --> 00:07:12,920
and took many thousands
of years to complete.
101
00:07:16,160 --> 00:07:19,999
We now know the reef has
dwindled and recovered
102
00:07:20,000 --> 00:07:22,959
many times in its long history,
103
00:07:22,960 --> 00:07:27,839
but it also has to withstand
a major change every 24 hours,
104
00:07:27,840 --> 00:07:30,880
as the tide retreats and comes back.
105
00:07:35,440 --> 00:07:38,799
At low tide, the water
drains away very quickly,
106
00:07:38,800 --> 00:07:42,440
leaving the topmost community
of creatures dangerously exposed.
107
00:07:48,320 --> 00:07:50,480
Some are washed out with the tide.
108
00:07:56,840 --> 00:07:58,680
Others swim to safety.
109
00:08:01,120 --> 00:08:03,560
But the coral polyps can't move.
110
00:08:08,120 --> 00:08:10,559
Temperatures on
the surface of the reef
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00:08:10,560 --> 00:08:13,520
can now reach a scorching
30 degrees centigrade.
112
00:08:16,480 --> 00:08:19,119
The exposed corals
could easily dry out
113
00:08:19,120 --> 00:08:22,040
and be damaged by intense
ultraviolet rays.
114
00:08:24,480 --> 00:08:27,240
But corals have ways
of protecting themselves.
115
00:08:29,560 --> 00:08:33,319
When exposed to air, they produce
huge amounts of mucus,
116
00:08:33,320 --> 00:08:36,280
which keeps them wet
and acts like a sunscreen.
117
00:08:38,320 --> 00:08:43,079
This remarkable slime actually
increases its UV resistance,
118
00:08:43,080 --> 00:08:45,720
becoming stronger
if the temperatures soar.
119
00:08:47,640 --> 00:08:52,320
So, the coral manages to survive for
the few hours that it's out of water.
120
00:08:55,840 --> 00:09:00,440
But there's one fish that manages to
turn this exposure to its advantage.
121
00:09:13,040 --> 00:09:18,119
The epaulette shark remains on the
reef even when the tide goes out.
122
00:09:18,120 --> 00:09:20,439
Of course, with so little water,
123
00:09:20,440 --> 00:09:23,359
it doesn't get as much oxygen
as it requires normally,
124
00:09:23,360 --> 00:09:27,999
but it deals with that possibility
by shutting off a part of its brain
125
00:09:28,000 --> 00:09:30,160
and so, reducing its oxygen demands.
126
00:09:31,760 --> 00:09:35,759
As the retreating tide exposes
the topmost branches of the corals,
127
00:09:35,760 --> 00:09:39,840
the shark remains in the little pools
between them for as long as it can.
128
00:09:42,640 --> 00:09:46,799
And then, it sets off
to try and find food -
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00:09:46,800 --> 00:09:51,559
shrimps, crabs and small worms
that live on the reef.
130
00:09:51,560 --> 00:09:55,679
And it does that by exploiting
another talent it has.
131
00:09:55,680 --> 00:09:57,720
It can, in effect, walk.
132
00:10:10,640 --> 00:10:14,559
It may be slow-going, but the
little shark manages to make its way
133
00:10:14,560 --> 00:10:18,640
between the rocky pools to look for
prey that may be imprisoned in them.
134
00:10:26,760 --> 00:10:28,399
It has the run of the place,
135
00:10:28,400 --> 00:10:31,840
until the tide returns once more
to flood the reeftop.
136
00:10:46,440 --> 00:10:50,119
So, the inhabitants of the reef,
each in its own way,
137
00:10:50,120 --> 00:10:53,480
deal with the daily hazards
brought by exposure.
138
00:11:00,120 --> 00:11:03,599
But there is one catastrophe
that can strike each year
139
00:11:03,600 --> 00:11:05,760
against which there is no defense.
140
00:11:14,000 --> 00:11:15,959
From November onwards,
141
00:11:15,960 --> 00:11:18,759
warm, moisture-laden winds
from the northwest
142
00:11:18,760 --> 00:11:21,999
sweep down across these tropic seas
143
00:11:22,000 --> 00:11:24,440
and it's then that cyclones form.
144
00:11:27,880 --> 00:11:32,360
They are, in fact, the biggest
killers of the reef's corals.
145
00:11:34,000 --> 00:11:38,879
But that doesn't mean that the
corals are permanently destroyed.
146
00:11:38,880 --> 00:11:41,680
Their resilience once more
comes apparent.
147
00:11:45,840 --> 00:11:48,999
And there's an extraordinary
example of that
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00:11:49,000 --> 00:11:51,040
in the most unlikely of places.
149
00:12:07,520 --> 00:12:10,960
This is the wreck
of the SS Yongala.
150
00:12:14,440 --> 00:12:17,280
It was sunk by a cyclone in 1911.
151
00:12:23,040 --> 00:12:27,800
It lies 30 meters below the surface
on a barren, sandy plain...
152
00:12:31,520 --> 00:12:34,960
...miles away from
any natural coral reefs.
153
00:12:39,520 --> 00:12:42,239
By the time it was discovered,
decades later,
154
00:12:42,240 --> 00:12:44,680
it had become an artificial reef...
155
00:12:47,200 --> 00:12:51,160
...and had been colonized by
an extraordinary variety of life.
156
00:12:57,280 --> 00:13:00,160
It was an oasis
in the featureless ocean.
157
00:13:16,600 --> 00:13:18,839
But in the century since it sank,
158
00:13:18,840 --> 00:13:22,480
the wreck has been hit
repeatedly by more cyclones.
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00:13:27,000 --> 00:13:29,559
The waters here are not deep
160
00:13:29,560 --> 00:13:34,280
so the turbulence created by
a cyclone can reach the sea floor.
161
00:13:43,600 --> 00:13:46,040
THUNDERCLAP
162
00:13:52,360 --> 00:13:54,999
Cyclones traveling
towards the coast
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00:13:55,000 --> 00:13:57,800
can rip up hundreds
of miles of coral.
164
00:14:02,680 --> 00:14:06,559
Captain Trevor Jackson, who has been
diving on this wreck for decades,
165
00:14:06,560 --> 00:14:12,880
saw the devastating effects caused
in 2011 by a category five cyclone.
166
00:14:14,480 --> 00:14:16,919
Cyclone Yahtzee, a massive system,
167
00:14:16,920 --> 00:14:19,039
crossed the coast
just north of here.
168
00:14:19,040 --> 00:14:20,439
The cyclone was so large,
169
00:14:20,440 --> 00:14:23,440
it generated waves that exposed
the top of the Yongala.
170
00:14:28,880 --> 00:14:31,520
THUNDERCLAP
171
00:14:40,360 --> 00:14:42,040
There was a lifting action...
172
00:14:45,080 --> 00:14:46,759
...and in the process,
173
00:14:46,760 --> 00:14:49,720
this scoured the top of the reef
of all marine life.
174
00:15:01,360 --> 00:15:06,280
What was once a thriving ecosystem
was now an almost bare skeleton.
175
00:15:11,000 --> 00:15:13,599
But amazingly,
the reef on the Yongala
176
00:15:13,600 --> 00:15:16,320
began to repair itself within months.
177
00:15:21,720 --> 00:15:23,800
Green algae appeared on the wreck.
178
00:15:25,400 --> 00:15:28,720
Barnacles followed,
allowing corals to get a grip.
179
00:15:36,040 --> 00:15:40,000
And soon, a new community
had established itself.
180
00:16:05,200 --> 00:16:08,319
One of the things that makes
the Yongala so unique
181
00:16:08,320 --> 00:16:12,919
is the way it rejuvenates itself
after a major weather event.
182
00:16:12,920 --> 00:16:15,279
In the course of the last
four or five years,
183
00:16:15,280 --> 00:16:17,560
about 80% of the reef has re-grown.
184
00:16:26,160 --> 00:16:30,359
The story of the Yongala shows that
a coral reef can, remarkably,
185
00:16:30,360 --> 00:16:32,800
recover from natural disaster.
186
00:16:43,520 --> 00:16:46,559
And such recovery can be
surprisingly quick
187
00:16:46,560 --> 00:16:48,960
when a reef is healthy
and in balance.
188
00:16:52,080 --> 00:16:55,760
Most of the reef's inhabitants
depend on one another for survival.
189
00:17:12,040 --> 00:17:15,599
But it is the coral that is
the foundation of the reef
190
00:17:15,600 --> 00:17:19,640
and it plays a crucial role
in many of the relationships.
191
00:17:28,880 --> 00:17:32,520
This is the crown-of-thorns starfish.
192
00:17:34,360 --> 00:17:37,119
For it, coral is food
193
00:17:37,120 --> 00:17:40,400
and it will eat relentlessly
if not kept in check.
194
00:17:41,480 --> 00:17:43,879
But to other creatures,
like the guard crab,
195
00:17:43,880 --> 00:17:45,520
coral is home.
196
00:17:50,920 --> 00:17:53,879
The crab is prepared
to defend its patch
197
00:17:53,880 --> 00:17:57,080
from the carnivorous starfish
at all costs.
198
00:18:01,960 --> 00:18:03,679
The crown-of-thorns, however,
199
00:18:03,680 --> 00:18:06,679
is much larger than most
other starfish on the reef,
200
00:18:06,680 --> 00:18:11,000
so the tiny crab is forced to
take a more stealthy approach.
201
00:18:15,600 --> 00:18:19,560
Hidden within the coral,
it waits for its moment to attack.
202
00:18:34,240 --> 00:18:37,919
The starfish has left itself
dangerously exposed,
203
00:18:37,920 --> 00:18:40,080
but the crab is cautious.
204
00:18:45,080 --> 00:18:47,759
When it can, the crab
uses its powerful pincers
205
00:18:47,760 --> 00:18:51,920
to snip at the starfish's
spines and tube-like feet...
206
00:19:04,960 --> 00:19:08,200
...before retreating back
into the safety of the coral.
207
00:19:10,160 --> 00:19:12,280
The crab has won this battle.
208
00:19:15,000 --> 00:19:17,559
But recently, something has changed
209
00:19:17,560 --> 00:19:19,480
and the balance has been upset.
210
00:19:23,520 --> 00:19:26,919
The number of crown-of-thorns
has increased dramatically
211
00:19:26,920 --> 00:19:29,640
and they've become
a big problem on the reef.
212
00:19:35,600 --> 00:19:37,239
To find out more,
213
00:19:37,240 --> 00:19:41,720
the Alucia is taking me to a research
station in the far north of the reef.
214
00:19:50,760 --> 00:19:55,560
It's situated on Lizard Island, where
we can observe this problem up close.
215
00:20:00,960 --> 00:20:04,279
Lizard is surrounded by some of
the most spectacular reefs
216
00:20:04,280 --> 00:20:05,920
on the entire barrier.
217
00:20:07,920 --> 00:20:11,800
But they are under attack
from the coral-eating starfish.
218
00:20:13,520 --> 00:20:16,039
And at the island's research station,
219
00:20:16,040 --> 00:20:20,040
they've been studying why we might be
seeing more of them than we used to.
220
00:20:29,840 --> 00:20:32,079
They have an extraordinary ability
221
00:20:32,080 --> 00:20:37,559
to suddenly increase vastly
in numbers, like a plague.
222
00:20:37,560 --> 00:20:41,759
There have been three such plagues
since the 1960s
223
00:20:41,760 --> 00:20:43,279
and, unfortunately,
224
00:20:43,280 --> 00:20:46,520
it seems as though we're in
the middle, now, of a fourth.
225
00:20:48,280 --> 00:20:52,199
You might think that these plagues
are just another natural disaster
226
00:20:52,200 --> 00:20:55,359
that the reef has had to
withstand, like cyclones.
227
00:20:55,360 --> 00:20:58,119
There are reasons to
suppose that, in fact,
228
00:20:58,120 --> 00:21:01,759
the plagues have been
affected by human activity -
229
00:21:01,760 --> 00:21:06,639
either through an accumulation of
run-off of fertilizers from the land
230
00:21:06,640 --> 00:21:10,479
that creates more food
for the young starfish,
231
00:21:10,480 --> 00:21:12,519
or because we have overfished
232
00:21:12,520 --> 00:21:15,360
and so destroyed
the natural balance of the reef.
233
00:21:16,960 --> 00:21:20,039
The starfish outbreaks
have been responsible
234
00:21:20,040 --> 00:21:23,680
for over 40% of the coral
loss of the last 30 years.
235
00:21:25,000 --> 00:21:29,400
It's just one of the huge changes
here witnessed by Dr Charlie Veron.
236
00:21:31,200 --> 00:21:33,559
In 1972, Charlie was appointed
237
00:21:33,560 --> 00:21:37,519
the reef's first full-time
coral scientist.
238
00:21:37,520 --> 00:21:40,679
He's gone on to become
a world authority on coral
239
00:21:40,680 --> 00:21:43,800
and has identified a third
of the world's known species.
240
00:21:45,240 --> 00:21:49,799
He was one of the first scientists to
spend time in this underwater world
241
00:21:49,800 --> 00:21:52,600
and that was due to
a particular piece of technology.
242
00:21:54,400 --> 00:21:58,639
What we knew about corals
at the beginning of the scuba era
243
00:21:58,640 --> 00:22:00,639
was just almost nothing.
244
00:22:00,640 --> 00:22:03,639
So, scuba gear must have
changed things radically.
245
00:22:03,640 --> 00:22:05,079
It changed everything.
246
00:22:05,080 --> 00:22:07,759
When you went down
the face of a coral reef,
247
00:22:07,760 --> 00:22:11,599
you could see how corals fed,
how they fought each other,
248
00:22:11,600 --> 00:22:13,399
how they reproduced and still,
249
00:22:13,400 --> 00:22:15,679
we're only just scratching
the surface.
250
00:22:15,680 --> 00:22:17,959
Think of all the things that happen
in a rainforest,
251
00:22:17,960 --> 00:22:19,439
how much we know about it.
252
00:22:19,440 --> 00:22:22,799
We haven't got a thousandth part of
that information on the coral reef yet.
253
00:22:22,800 --> 00:22:25,239
'But since Charlie's
first discoveries,
254
00:22:25,240 --> 00:22:27,799
'the reef has altered dramatically.'
255
00:22:27,800 --> 00:22:33,199
I've been going back to the
same spots 10, 20, 30, 40 years ago
256
00:22:33,200 --> 00:22:36,039
and every time I go back,
257
00:22:36,040 --> 00:22:39,879
I'm sickened by some of
the changes I've seen.
258
00:22:39,880 --> 00:22:42,279
Sometimes, I go back,
I know it's the same spot
259
00:22:42,280 --> 00:22:43,919
and I can barely recognize it.
260
00:22:43,920 --> 00:22:46,239
Some species have been wiped out
in the shallows now.
261
00:22:46,240 --> 00:22:48,400
It's already happened.
262
00:22:50,200 --> 00:22:54,280
What Charlie had witnessed were
the effects of mankind upon the reef.
263
00:22:58,560 --> 00:23:03,399
When I myself first visited the
Queensland coast almost 60 years ago,
264
00:23:03,400 --> 00:23:05,200
it was very different.
265
00:23:14,400 --> 00:23:17,679
Since then, like many
coastlines around the world,
266
00:23:17,680 --> 00:23:20,479
there has been a massive
increase in population
267
00:23:20,480 --> 00:23:22,800
and an explosion of industry.
268
00:23:37,520 --> 00:23:42,839
By 1975, the reef had been declared
a National Marine Park.
269
00:23:42,840 --> 00:23:46,279
It was the biggest one
of its kind in the world.
270
00:23:46,280 --> 00:23:49,759
But then, a new threat
began to be recognized -
271
00:23:49,760 --> 00:23:53,399
not only to the reef,
but to the world's oceans -
272
00:23:53,400 --> 00:23:54,840
climate change.
273
00:23:56,520 --> 00:23:59,880
THUNDERCLAPS
274
00:24:02,520 --> 00:24:06,359
There is more carbon dioxide
in our atmosphere now
275
00:24:06,360 --> 00:24:09,440
than there has been in 800,000 years.
276
00:24:12,400 --> 00:24:15,519
Industrialized nations
have been burning fossil fuels
277
00:24:15,520 --> 00:24:17,520
at an alarming rate.
278
00:24:19,440 --> 00:24:22,159
Global warming is slowly
heating up our planet
279
00:24:22,160 --> 00:24:24,840
and threatens to cause
huge problems for us all.
280
00:24:27,320 --> 00:24:32,680
Around 30% of the carbon dioxide
we produce is absorbed by the ocean.
281
00:24:36,040 --> 00:24:39,119
As a result, we're seeing
an increase in the temperature
282
00:24:39,120 --> 00:24:40,720
and acidity of our seas.
283
00:24:43,440 --> 00:24:46,600
Both are killing
the inhabitants of the reef.
284
00:24:51,880 --> 00:24:54,080
But how quickly is it being damaged?
285
00:24:57,360 --> 00:25:02,239
To find out, I'm heading to meet
Professor Ove Hoegh-Guldberg.
286
00:25:02,240 --> 00:25:05,720
He's studying the effects
of climate change on coral.
287
00:25:10,440 --> 00:25:12,679
Ove is based on Heron Island,
288
00:25:12,680 --> 00:25:16,039
near the southern end
of the Great Barrier.
289
00:25:16,040 --> 00:25:20,319
Heron is a low, sandy island,
50 miles out from the mainland,
290
00:25:20,320 --> 00:25:21,960
right on the reef itself...
291
00:25:24,840 --> 00:25:28,040
...so its research station
is very well-placed.
292
00:25:29,640 --> 00:25:32,319
Here, Ove is carrying out
an experiment
293
00:25:32,320 --> 00:25:34,320
to see how the reef is going to cope.
294
00:25:35,360 --> 00:25:37,199
At the research station here,
295
00:25:37,200 --> 00:25:41,240
the experiment we're running is
really climate change sped up.
296
00:25:42,560 --> 00:25:46,359
Because it's often hard for people
to really get their heads around
297
00:25:46,360 --> 00:25:48,919
when you talk about
global change over decades
298
00:25:48,920 --> 00:25:51,079
and what might happen
to coral reefs.
299
00:25:51,080 --> 00:25:54,039
We have, essentially,
in these experiments, sped things up
300
00:25:54,040 --> 00:25:56,359
so that you can literally,
over a year,
301
00:25:56,360 --> 00:26:00,120
see the impacts of what might be
occurring over the next hundred.
302
00:26:03,960 --> 00:26:07,159
Each of these tanks contains
a miniature coral reef
303
00:26:07,160 --> 00:26:09,679
with the same species of coral.
304
00:26:09,680 --> 00:26:11,919
But each is being subjected to
305
00:26:11,920 --> 00:26:15,959
slightly different conditions
of temperature and acidity -
306
00:26:15,960 --> 00:26:19,760
the two factors that are most likely
to alter with climate change.
307
00:26:24,760 --> 00:26:28,999
Using these tanks, scientists
have shown that increasing acidity
308
00:26:29,000 --> 00:26:32,640
restricts hard corals from building
their limestone skeletons.
309
00:26:35,880 --> 00:26:37,799
And a rise in temperature -
310
00:26:37,800 --> 00:26:40,359
a single degree centigrade
warmer than normal -
311
00:26:40,360 --> 00:26:42,959
can cause corals
to become so stressed
312
00:26:42,960 --> 00:26:45,879
that they eject
the photosynthesizing algae
313
00:26:45,880 --> 00:26:48,560
that enable them to grow
and give some color.
314
00:26:53,760 --> 00:26:57,000
So they bleach,
turning ghostly white.
315
00:27:07,400 --> 00:27:09,199
If you go back in time,
316
00:27:09,200 --> 00:27:14,079
you can see the big swings between
ice ages and the warm periods
317
00:27:14,080 --> 00:27:16,319
where the Great Barrier Reef
disappears and regrows
318
00:27:16,320 --> 00:27:18,959
and that's happened numerous times.
319
00:27:18,960 --> 00:27:21,159
So, we've always had changes,
320
00:27:21,160 --> 00:27:25,679
but we're talking about changes
over 10,000 years, in those cases.
321
00:27:25,680 --> 00:27:29,799
But we're now seeing is
the equivalent in a few decades.
322
00:27:29,800 --> 00:27:32,800
And that, of course, is stretching
life's capacity to keep up.
323
00:27:39,480 --> 00:27:44,199
Organisms, ecosystems are falling
behind as the world changes,
324
00:27:44,200 --> 00:27:47,640
faster than it has in this
enormous amount of time.
325
00:27:53,040 --> 00:27:57,959
It's been shown here that a rise
of just two degrees centigrade
326
00:27:57,960 --> 00:28:01,000
will turn a healthy reef
into a decimated one.
327
00:28:02,440 --> 00:28:06,119
And such a rise will almost
certainly happen in these seas
328
00:28:06,120 --> 00:28:08,920
if we continue to do
what we are doing.
329
00:28:19,400 --> 00:28:21,799
As Ove's tests suggest,
330
00:28:21,800 --> 00:28:24,359
this man-made problem
has reached the point
331
00:28:24,360 --> 00:28:26,800
where it needs a man-made solution.
332
00:28:30,920 --> 00:28:33,119
I'm returning to mainland Australia
333
00:28:33,120 --> 00:28:36,039
to meet the scientists who are
approaching this problem
334
00:28:36,040 --> 00:28:37,800
in a radically new way.
335
00:28:40,040 --> 00:28:44,239
The Australian Institute of
Marine Science, AIMS,
336
00:28:44,240 --> 00:28:47,680
is based in northeast Queensland,
right on the coast.
337
00:28:50,960 --> 00:28:55,440
Here, pioneering research is pushing
the boundaries of coral science.
338
00:29:00,760 --> 00:29:04,639
Over three million liters
of filtered seawater
339
00:29:04,640 --> 00:29:07,240
are pumped through
these tanks every day.
340
00:29:08,440 --> 00:29:11,799
So, it's possible for scientists
to study the minute
341
00:29:11,800 --> 00:29:16,600
and often very complex changes
that can affect coral's health.
342
00:29:20,240 --> 00:29:22,879
So, here, they're also
conducting research
343
00:29:22,880 --> 00:29:25,159
to see whether it
might not be possible
344
00:29:25,160 --> 00:29:29,360
to devise techniques of restoring
damaged reefs back to health.
345
00:29:31,560 --> 00:29:35,680
In these tanks, they can simulate
the exact conditions of the reef.
346
00:29:37,640 --> 00:29:40,559
They've been so successful
that remarkably,
347
00:29:40,560 --> 00:29:44,279
the corals respond to the same
astronomic and seasonal rhythms
348
00:29:44,280 --> 00:29:45,880
as those out in the ocean.
349
00:29:49,880 --> 00:29:53,720
And that is proving useful for
one particular experiment.
350
00:29:56,240 --> 00:29:59,759
Corals are usually able to adapt
to changing circumstances,
351
00:29:59,760 --> 00:30:01,040
given enough time.
352
00:30:05,960 --> 00:30:09,280
And that is partly due to
the way they reproduce.
353
00:30:12,720 --> 00:30:14,879
After the first full moon in October,
354
00:30:14,880 --> 00:30:18,000
the great synchronized
coral spawning event begins.
355
00:30:38,960 --> 00:30:42,400
It's a wonderful,
annual rejuvenation.
356
00:30:48,880 --> 00:30:53,240
Hundreds of species release
sperm and eggs into the ocean.
357
00:30:56,920 --> 00:31:00,999
Just as pollen from plants is
blown far and wide by the wind,
358
00:31:01,000 --> 00:31:04,720
so coral spawn is swept away
by the ocean currents.
359
00:31:07,480 --> 00:31:11,079
And at the same time,
under the same moonlight,
360
00:31:11,080 --> 00:31:14,800
the corals will spawn here
in the laboratory tanks.
361
00:31:19,280 --> 00:31:22,919
Using red light, so as
not to disturb the process,
362
00:31:22,920 --> 00:31:25,520
scientists wait for
the moment of release.
363
00:31:39,760 --> 00:31:41,399
And when it finally happens,
364
00:31:41,400 --> 00:31:44,440
they move fast to collect
the sperm and the eggs.
365
00:31:49,280 --> 00:31:52,559
It's their one chance to get
all the samples they need
366
00:31:52,560 --> 00:31:54,520
for a year's worth of research.
367
00:31:57,680 --> 00:32:00,480
But what exactly are they
planning to do with them?
368
00:32:03,920 --> 00:32:08,599
Here, Dr Madeleine van Oppen has
been selectively breeding them,
369
00:32:08,600 --> 00:32:13,279
using much the same techniques that
we've used to produce crops on land
370
00:32:13,280 --> 00:32:16,319
that are resistant
to drought and disease.
371
00:32:16,320 --> 00:32:18,799
It's the first time that
selective breeding
372
00:32:18,800 --> 00:32:21,200
has been used in marine conservation.
373
00:32:25,280 --> 00:32:27,599
They release their
sperm and eggs in bundles
374
00:32:27,600 --> 00:32:30,559
and those bundles float
to the surface of the tank.
375
00:32:30,560 --> 00:32:34,280
We then agitate that to separate
the eggs from the sperm.
376
00:32:37,280 --> 00:32:38,879
And we use that to set up
377
00:32:38,880 --> 00:32:41,920
our specific in vitro
processes, basically.
378
00:32:45,800 --> 00:32:48,079
In the ocean, there is the potential
379
00:32:48,080 --> 00:32:51,200
for different species of coral
to breed with each other.
380
00:32:52,480 --> 00:32:54,479
So, here, scientists wonder
381
00:32:54,480 --> 00:32:57,639
if you might be able to
produce a new kind of coral
382
00:32:57,640 --> 00:33:01,240
that proves more successful in
the changing waters of the reef.
383
00:33:03,160 --> 00:33:05,479
The problem that corals
are facing now is that
384
00:33:05,480 --> 00:33:08,319
the change of the environment
is extremely fast -
385
00:33:08,320 --> 00:33:10,119
much faster than ever recorded -
386
00:33:10,120 --> 00:33:12,399
so we need to help them
a little bit in the lab.
387
00:33:12,400 --> 00:33:16,000
We need to speed up those
natural processes of evolution.
388
00:33:18,320 --> 00:33:23,399
Van Oppen's aim is to use selective
breeding to produce strains of coral
389
00:33:23,400 --> 00:33:27,200
that are able to withstand the
worst effects of climate change...
390
00:33:29,560 --> 00:33:34,760
...and to use them to bring life back
to worst-affected part of the reef.
391
00:33:37,080 --> 00:33:39,079
Maybe in five years or so,
392
00:33:39,080 --> 00:33:42,159
we will be allowed
to place those corals
393
00:33:42,160 --> 00:33:45,319
onto a real reef, a disturbed reef -
394
00:33:45,320 --> 00:33:47,999
and test it and these
selectively-bred corals
395
00:33:48,000 --> 00:33:50,560
will be able to restore
that reef faster.
396
00:33:51,880 --> 00:33:55,159
And you have to realize, this is
really a last resort option.
397
00:33:55,160 --> 00:33:58,680
We wouldn't want to do that if
the reef is able to restore itself.
398
00:34:04,200 --> 00:34:08,039
But is there a chance that the reef,
damaged by our activities,
399
00:34:08,040 --> 00:34:10,680
could restore itself
without our help?
400
00:34:13,280 --> 00:34:15,599
Well, we now think that
there may be clues
401
00:34:15,600 --> 00:34:18,600
in the reef's most distant
and mysterious regions.
402
00:34:25,920 --> 00:34:28,559
There are still parts of
the Great Barrier Reef
403
00:34:28,560 --> 00:34:31,199
that are virtually unexplored.
404
00:34:31,200 --> 00:34:35,479
But today, we have got remarkable
new underwater vessels,
405
00:34:35,480 --> 00:34:38,399
like this submersible,
that can take us to places
406
00:34:38,400 --> 00:34:42,999
where no unprotected human being
could possibly go.
407
00:34:43,000 --> 00:34:47,079
What they will find down there,
nobody knows.
408
00:34:47,080 --> 00:34:49,279
But I'm lucky enough
to be one of those
409
00:34:49,280 --> 00:34:51,720
who's about to go down to find out.
410
00:34:54,360 --> 00:34:56,199
At the outer edge of the reef,
411
00:34:56,200 --> 00:35:01,360
the continental shelf plunges down
over 2,000 meters to the seafloor.
412
00:35:05,920 --> 00:35:09,199
The Alucia has brought us
over the edge of the drop-off,
413
00:35:09,200 --> 00:35:12,040
90 miles out into the Coral Sea...
414
00:35:15,360 --> 00:35:17,520
...out to Osprey Reef.
415
00:35:20,000 --> 00:35:23,919
Here at Osprey, this sheer
vertical drop of the seafloor
416
00:35:23,920 --> 00:35:26,880
enables us to see corals
at a variety of depths.
417
00:35:28,600 --> 00:35:31,359
Between 100 and 150 meters down,
418
00:35:31,360 --> 00:35:33,759
daylight is reduced to a glimmer.
419
00:35:33,760 --> 00:35:36,999
This is the mesophotic zone.
420
00:35:37,000 --> 00:35:40,279
Here, a mysterious community
of corals is thriving,
421
00:35:40,280 --> 00:35:43,319
despite the damage being done
to the reef above.
422
00:35:43,320 --> 00:35:46,239
The Great Barrier Reef,
it's a marvel beyond marvels.
423
00:35:46,240 --> 00:35:51,519
It's a million species living
in this symbiotic tangle,
424
00:35:51,520 --> 00:35:53,039
half of which we don't know.
425
00:35:53,040 --> 00:35:55,719
I mean, when you get
to mesophotic depths,
426
00:35:55,720 --> 00:35:58,079
we know very few of
the species down there.
427
00:35:58,080 --> 00:36:01,599
It literally is one of the
last frontiers of biology,
428
00:36:01,600 --> 00:36:03,040
to understand this system.
429
00:36:06,480 --> 00:36:09,719
Scientists are now beginning
to wonder if these corals
430
00:36:09,720 --> 00:36:13,920
might have the potential to restore
the damaged parts of the reef.
431
00:36:15,200 --> 00:36:17,440
RADIO: '..Down about 100 meters...'
432
00:36:23,360 --> 00:36:25,399
Our state-of-the-art submersible
433
00:36:25,400 --> 00:36:29,239
is going to take me to see
these deep corals for myself
434
00:36:29,240 --> 00:36:31,080
and even bring back a sample.
435
00:36:36,240 --> 00:36:38,319
Nadir in position.
436
00:36:38,320 --> 00:36:40,399
Are we clear to vent?
437
00:36:40,400 --> 00:36:43,439
You are clear to vent,
clear to vent.
438
00:36:43,440 --> 00:36:44,880
Roger. Venting now.
439
00:36:57,400 --> 00:37:00,720
We are descending
into the twilight zone.
440
00:37:07,800 --> 00:37:10,479
As we drop down the face of the reef,
441
00:37:10,480 --> 00:37:12,600
the light begins to dim.
442
00:37:21,000 --> 00:37:23,239
At about 100 meters,
443
00:37:23,240 --> 00:37:26,479
we enter the mesophotic zone.
444
00:37:26,480 --> 00:37:29,520
"Mesophotic" literally means
"middle light".
445
00:37:32,000 --> 00:37:35,360
The corals here are beginning
to look very different.
446
00:37:37,760 --> 00:37:40,319
Despite the apparent
lack of light down here,
447
00:37:40,320 --> 00:37:43,999
there's still enough for some
corals to photosynthesize,
448
00:37:44,000 --> 00:37:46,919
just like their relations
closer to the surface.
449
00:37:46,920 --> 00:37:50,759
And to do that, they've formed
these flat, broad plates
450
00:37:50,760 --> 00:37:53,120
to collect what
little light there is.
451
00:37:57,800 --> 00:38:02,440
Mesophotic corals lie mostly out
of reach of cyclones and bleaching.
452
00:38:04,840 --> 00:38:07,999
So, one of the big questions
facing scientists is,
453
00:38:08,000 --> 00:38:13,080
could these deeper corals naturally
repopulate the damaged reefs above?
454
00:38:24,400 --> 00:38:27,840
We've now passed beyond
the mesophotic zone.
455
00:38:31,080 --> 00:38:33,639
The light begins to
disappear completely
456
00:38:33,640 --> 00:38:36,200
and the reef changes again.
457
00:38:48,040 --> 00:38:50,959
Most of the light that
filters down from above
458
00:38:50,960 --> 00:38:53,839
comes from the blue end
of the spectrum,
459
00:38:53,840 --> 00:38:58,359
so the rock surface
ahead of me looks very dull.
460
00:38:58,360 --> 00:39:01,480
But turn on the lights
and it looks very different.
461
00:39:25,720 --> 00:39:27,759
Despite their remoteness,
462
00:39:27,760 --> 00:39:30,639
these strange relatives
of reef-building corals
463
00:39:30,640 --> 00:39:33,000
are still part of
the great reef system.
464
00:39:35,120 --> 00:39:38,880
To understand how they're connected,
we need to study them closely.
465
00:39:41,080 --> 00:39:44,840
So, this seems an excellent place
to collect a sample.
466
00:39:47,280 --> 00:39:51,719
But maneuvering our eight-tonne
submersible close to the rock face
467
00:39:51,720 --> 00:39:53,360
is a delicate operation.
468
00:40:12,360 --> 00:40:14,080
Oh, that's great.
469
00:40:22,800 --> 00:40:25,919
The chances are that this
could well be a species
470
00:40:25,920 --> 00:40:27,880
that no-one has ever seen before.
471
00:40:31,360 --> 00:40:34,200
But things don't go quite to plan.
472
00:40:37,000 --> 00:40:39,680
Oh, no! We're going to have
to go and fetch that.
473
00:40:52,720 --> 00:40:54,040
There it is.
474
00:41:08,080 --> 00:41:09,480
Oh, terrific!
475
00:41:14,160 --> 00:41:15,680
Success!
476
00:41:25,400 --> 00:41:28,519
As we descend past
the 200 meter mark,
477
00:41:28,520 --> 00:41:32,280
the coral finally begins
to disappear altogether.
478
00:41:37,560 --> 00:41:39,759
Surface, surface, Nadir.
479
00:41:39,760 --> 00:41:44,080
My depth now, 300 meters. Over.
480
00:41:45,480 --> 00:41:50,159
At this depth, the pressure bearing
down on the submersible's sphere
481
00:41:50,160 --> 00:41:53,000
is more than 30 times
that at the surface.
482
00:41:55,200 --> 00:41:59,280
That's an incredible
450 pounds per square inch.
483
00:42:03,600 --> 00:42:06,599
Here, there's a sediment that is
drifting down from above,
484
00:42:06,600 --> 00:42:09,239
cloaking the surface of the reef.
485
00:42:09,240 --> 00:42:11,879
That means it's very difficult
for any organism
486
00:42:11,880 --> 00:42:16,319
to get a hold of the rock, because
it's continually being swept down.
487
00:42:16,320 --> 00:42:21,839
The sediment itself is the result of the erosion
of the coral skeletons from high above,
488
00:42:21,840 --> 00:42:25,199
but also from the remains of coral
489
00:42:25,200 --> 00:42:28,439
that parrot fish have
munched and excreted
490
00:42:28,440 --> 00:42:30,799
and it's slowly drifting down here.
491
00:42:30,800 --> 00:42:34,160
So, this is so deep,
it's almost barren.
492
00:42:44,400 --> 00:42:46,080
But not quite.
493
00:42:48,680 --> 00:42:51,479
At almost the deepest point
of our dive,
494
00:42:51,480 --> 00:42:53,320
something pays us a visit.
495
00:42:56,800 --> 00:42:59,839
There's a fish to your right,
David. On your shoulder.
496
00:42:59,840 --> 00:43:01,240
Look at this!
497
00:43:06,960 --> 00:43:09,519
It's a deep-water grouper.
498
00:43:09,520 --> 00:43:13,640
No-one has ever seen them up close
like this, at this depth.
499
00:43:21,200 --> 00:43:24,720
'It appears to find the sub
and its occupants fascinating.'
500
00:43:27,000 --> 00:43:30,320
And he's big, this boy. He must be...
501
00:43:32,600 --> 00:43:35,600
...four, five feet long -
a couple of meters, almost.
502
00:43:38,440 --> 00:43:39,639
Hello.
503
00:43:39,640 --> 00:43:41,040
Oh, gosh!
504
00:43:45,760 --> 00:43:49,120
And why he is down here,
what he's looking for - who knows?
505
00:43:56,920 --> 00:43:58,120
He's going up.
506
00:43:59,960 --> 00:44:01,200
So are we.
507
00:44:11,520 --> 00:44:16,200
As we ascend, light and color
returns to the reef around us.
508
00:44:58,360 --> 00:45:02,359
'Our on-board reef scientist,
Professor Justin Marshall,
509
00:45:02,360 --> 00:45:05,799
'is on hand to retrieve the sample
we gathered in the darkness.'
510
00:45:05,800 --> 00:45:08,479
What do you reckon?
Well, it's fantastic.
511
00:45:08,480 --> 00:45:12,319
This is one of the deepest
samples ever from Osprey Reef.
512
00:45:12,320 --> 00:45:14,799
It's wonderful. Will it survive?
Will it still live?
513
00:45:14,800 --> 00:45:17,239
It will still live
and we'll take samples back
514
00:45:17,240 --> 00:45:20,600
to the University of Queensland
and work on it there. Great.
515
00:45:22,640 --> 00:45:25,799
In fact, they think this coral
has never been reported
516
00:45:25,800 --> 00:45:29,120
in this part of the world before
and may be new to science.
517
00:45:33,760 --> 00:45:36,479
We are a long way off
from having a solution
518
00:45:36,480 --> 00:45:39,680
to the threats which now face
the Great Barrier Reef.
519
00:45:41,720 --> 00:45:43,759
But in these deep water samples
520
00:45:43,760 --> 00:45:46,599
and in the scientists'
experimental tanks,
521
00:45:46,600 --> 00:45:48,480
there is a small glimmer of hope.
522
00:45:51,080 --> 00:45:53,400
But time is not on our side -...
523
00:45:57,560 --> 00:46:01,200
...an opinion shared by many of the
scientists I've met along the way.
524
00:46:05,920 --> 00:46:08,319
Are you fearful for
the future of the reef?
525
00:46:08,320 --> 00:46:09,999
There will be change, for sure.
526
00:46:10,000 --> 00:46:14,839
I mean, we're seeing change within
our own human lives' timescales now.
527
00:46:14,840 --> 00:46:16,599
And what's your prediction about
528
00:46:16,600 --> 00:46:19,719
what it's going to look like
in another hundred years?
529
00:46:19,720 --> 00:46:21,759
The sea levels will be higher.
530
00:46:21,760 --> 00:46:24,559
We want to know - as
a scientist, we want to know
531
00:46:24,560 --> 00:46:26,799
how the Great Barrier Reef
will respond.
532
00:46:26,800 --> 00:46:30,639
Whether it has
the resilience to bounce back
533
00:46:30,640 --> 00:46:35,160
with the future changes to
the climate remains to be seen.
534
00:46:39,920 --> 00:46:41,439
Here on the Great Barrier Reef,
535
00:46:41,440 --> 00:46:45,080
we've lost about 50% of the coral
since the early 1980s.
536
00:46:47,280 --> 00:46:51,439
Coral provides a habitat
for over a million species.
537
00:46:51,440 --> 00:46:54,679
This is such a fundamental
part of our oceans
538
00:46:54,680 --> 00:46:57,479
and the fact that it's going
to disappear on our watch,
539
00:46:57,480 --> 00:46:58,720
it's incredible.
540
00:47:16,400 --> 00:47:20,079
When the Great Barrier Reef
starts to go seriously backwards,
541
00:47:20,080 --> 00:47:21,879
the next generation is going to say,
542
00:47:21,880 --> 00:47:25,719
"Why didn't you guys do something
about it when you had a chance?"
543
00:47:25,720 --> 00:47:27,759
And well may they ask that
544
00:47:27,760 --> 00:47:30,799
because we're not doing
what we should be doing
545
00:47:30,800 --> 00:47:32,840
and we're going to pay the price.
546
00:47:51,000 --> 00:47:54,399
The Great Barrier Reef
is in grave danger.
547
00:47:54,400 --> 00:47:57,599
The twin perils brought
by climate change
548
00:47:57,600 --> 00:48:02,079
and increase in the temperature of
the ocean and in its acidity
549
00:48:02,080 --> 00:48:05,159
threaten its very existence.
550
00:48:05,160 --> 00:48:08,399
If they continue to rise
at the present rate,
551
00:48:08,400 --> 00:48:11,879
the reefs will be gone
within decades.
552
00:48:11,880 --> 00:48:15,680
And that would be
a global catastrophe.
553
00:48:18,520 --> 00:48:22,439
About one quarter of the
species of fish in the world
554
00:48:22,440 --> 00:48:25,919
spend some part of their lives
in the reefs.
555
00:48:25,920 --> 00:48:29,520
If the reefs go,
the fish will also disappear.
556
00:48:30,720 --> 00:48:33,359
And that could affect the livelihood
557
00:48:33,360 --> 00:48:36,840
and diet of human
communities worldwide.
558
00:48:38,440 --> 00:48:42,519
But there's surely another reason
why we should protect the reefs.
559
00:48:42,520 --> 00:48:46,639
They are among this planet's
richest, most complex
560
00:48:46,640 --> 00:48:49,120
and most beautiful ecosystems.
561
00:49:05,880 --> 00:49:10,599
Do we really care so little about
the Earth on which we live
562
00:49:10,600 --> 00:49:14,599
that we don't wish to protect
one of its greatest wonders
563
00:49:14,600 --> 00:49:17,640
from the consequences
of our behavior?
564
00:49:42,440 --> 00:49:45,159
For this series, the
production team were determined
565
00:49:45,160 --> 00:49:47,919
to show the Barrier Reef
in a new way,
566
00:49:47,920 --> 00:49:50,760
by filming in some of
its most remote areas...
567
00:49:53,240 --> 00:49:54,919
...and allowing me to meet
568
00:49:54,920 --> 00:49:58,000
some of its more unusual
and surprising inhabitants.
569
00:50:00,520 --> 00:50:03,759
'This took us out onto the top
of Heron Island's reef,
570
00:50:03,760 --> 00:50:05,880
'which is only exposed at low tide.
571
00:50:09,480 --> 00:50:12,319
'But we had to tread carefully,
accompanied by guides,
572
00:50:12,320 --> 00:50:15,520
'to ensure that we didn't
damage any of the coral.'
573
00:50:16,840 --> 00:50:18,999
Anybody who's coming on here,
it's weird at first,
574
00:50:19,000 --> 00:50:22,439
but just try and walk on the
dead coral - the concrete stuff.
575
00:50:22,440 --> 00:50:24,919
'We were there to film
an elusive creature
576
00:50:24,920 --> 00:50:28,559
'that feeds in this special habitat
when the tide is out -
577
00:50:28,560 --> 00:50:30,080
'the epaulette shark.'
578
00:50:31,400 --> 00:50:34,839
There's one with a tail -
the first one is there.
579
00:50:34,840 --> 00:50:37,480
Just gone. It's gone under there.
580
00:50:39,720 --> 00:50:44,679
'Professor Gillian Renshaw has been
studying these sharks for 20 years.'
581
00:50:44,680 --> 00:50:46,839
It's very hard to see
the epaulettes
582
00:50:46,840 --> 00:50:50,039
because they're cryptically
colored and blend in very well
583
00:50:50,040 --> 00:50:53,720
with the fingers of coral that are
rising out of the reef platform.
584
00:50:55,160 --> 00:50:57,999
'It's a challenging location,
not least because
585
00:50:58,000 --> 00:51:00,840
'it's only accessible for
short periods of time.'
586
00:51:03,080 --> 00:51:05,319
We've got probably about 40 minutes
587
00:51:05,320 --> 00:51:07,439
to get all of the shots
that we need,
588
00:51:07,440 --> 00:51:10,799
so I shouldn't really be talking
to you, we should be getting this.
589
00:51:10,800 --> 00:51:15,039
OK, quiet please!
Camera's rolling. And action, David.
590
00:51:15,040 --> 00:51:18,319
The epaulette shark
remains on the reef,
591
00:51:18,320 --> 00:51:20,520
even when the tide goes out.
592
00:51:21,800 --> 00:51:23,799
Of course, with so little water,
593
00:51:23,800 --> 00:51:27,040
it doesn't get as much oxygen
as it requires normally, but...
594
00:51:29,000 --> 00:51:30,919
'Although my piece is done,
595
00:51:30,920 --> 00:51:34,159
'the team must now film the shark's
unique walking behavior.'
596
00:51:34,160 --> 00:51:36,999
The water is literally pouring
in around the equipment
597
00:51:37,000 --> 00:51:38,639
and over our feet.
598
00:51:38,640 --> 00:51:41,279
We've got about 10 to 15 minutes
to get this sequence finished
599
00:51:41,280 --> 00:51:43,639
and get back in the boats
before we're literally cut off
600
00:51:43,640 --> 00:51:45,720
and we can't get back to the boats.
601
00:51:47,760 --> 00:51:50,200
'The tide creeps in around us.'
602
00:51:55,920 --> 00:51:58,120
He's walking beautifully, now.
Look at that.
603
00:52:00,320 --> 00:52:03,599
Let's try and get it
in the water a bit.
604
00:52:03,600 --> 00:52:06,480
Really nice performance
from the epaulette shark.
605
00:52:08,480 --> 00:52:11,120
'Now, it's a race against time
to get off the reef.'
606
00:52:12,400 --> 00:52:13,799
Are we ready for the boat, now?
607
00:52:13,800 --> 00:52:16,200
Geraldine, can we get
David on, please?
608
00:52:21,360 --> 00:52:23,720
Yeah, looked stunning.
Worth the stress.
609
00:52:25,520 --> 00:52:28,679
'This trip took us from
the very top of the reef
610
00:52:28,680 --> 00:52:30,720
'down almost to its bottom...
611
00:52:31,880 --> 00:52:34,680
'..for our most ambitious
sequence of the series -...
612
00:52:36,080 --> 00:52:38,559
'..to attempt
the deepest dive in this area
613
00:52:38,560 --> 00:52:42,200
'and collect a sample of the
mysterious coral that survives there.
614
00:52:43,720 --> 00:52:46,199
'And it's down to
cameraman Paul Williams
615
00:52:46,200 --> 00:52:48,400
'to film our mission
single-handedly.'
616
00:52:50,320 --> 00:52:52,159
I'm on my own down there.
617
00:52:52,160 --> 00:52:54,199
I've gone over it and over it
again in my mind,
618
00:52:54,200 --> 00:52:57,039
about what we're trying to do
and how we're going to do it,
619
00:52:57,040 --> 00:52:59,039
so I think I've got it locked in.
620
00:52:59,040 --> 00:53:01,079
I hope haven't forgotten anything.
621
00:53:01,080 --> 00:53:03,199
'It's something of
a squeeze in the sub,
622
00:53:03,200 --> 00:53:06,199
'with all of Paul's
filming equipment.'
623
00:53:06,200 --> 00:53:08,720
Do you mind if I just
give you that for a moment?
624
00:53:09,840 --> 00:53:12,639
'But our third crew member
is essential.
625
00:53:12,640 --> 00:53:14,880
'He's the pilot, Buck Taylor.'
626
00:53:19,160 --> 00:53:22,199
I'm sitting with a big
camera on my shoulder
627
00:53:22,200 --> 00:53:25,239
and two other cameras,
which were outside the sub,
628
00:53:25,240 --> 00:53:28,360
controlled by laptops
which were both on my lap.
629
00:53:32,160 --> 00:53:35,199
The sound kit was under Buck's feet.
630
00:53:35,200 --> 00:53:36,360
It was tight in there.
631
00:53:44,720 --> 00:53:46,079
David, do you mind?
632
00:53:46,080 --> 00:53:49,039
Would you get your towel and just
give that a little wipe there? Yup.
633
00:53:49,040 --> 00:53:50,880
Thank you, sir.
634
00:53:53,800 --> 00:53:55,959
'For the first part of the dive,
635
00:53:55,960 --> 00:53:58,560
'underwater cameramen
filmed the sub's descent.
636
00:53:59,840 --> 00:54:02,840
'But at about 60 meters,
they reached their limit.
637
00:54:05,080 --> 00:54:07,159
'It's only possible
to venture further
638
00:54:07,160 --> 00:54:09,520
'within the protection
of the submarine.
639
00:54:10,880 --> 00:54:14,239
'As we enter the mesophotic zone,
around 100 meters down,
640
00:54:14,240 --> 00:54:15,760
'we're on our own.
641
00:54:20,120 --> 00:54:22,639
'To get the best shots
of the reef beyond,
642
00:54:22,640 --> 00:54:25,600
'Paul requires all of
Buck's skill as a pilot.'
643
00:54:26,800 --> 00:54:29,559
Do you want to try
some other light options?
644
00:54:29,560 --> 00:54:32,039
What have you got?
I can give you that.
645
00:54:32,040 --> 00:54:35,839
Yeah, put the higher ones on,
take the lower ones off.
646
00:54:35,840 --> 00:54:40,039
How's that? Yes. Actually,
that looks better. Isn't it lovely?
647
00:54:40,040 --> 00:54:42,439
Probably full of nooks
and crannies. Yeah.
648
00:54:42,440 --> 00:54:44,199
Buck, the sub driver, was brilliant.
649
00:54:44,200 --> 00:54:46,119
He'd find a drift in the currents
650
00:54:46,120 --> 00:54:48,119
and then we'd just drift
across the coral.
651
00:54:48,120 --> 00:54:50,399
What's nice is,
I can actually see the wall.
652
00:54:50,400 --> 00:54:53,399
That's a very good angle for me.
Is it? Yeah.
653
00:54:53,400 --> 00:54:56,759
So, just let us drift
a tiny bit to starboard.
654
00:54:56,760 --> 00:54:58,719
And... action, David.
655
00:54:58,720 --> 00:55:04,279
This wall of rock ahead of me is
actually the flank of Osprey Reef -
656
00:55:04,280 --> 00:55:07,039
an oasis for life.
657
00:55:07,040 --> 00:55:09,679
'But we weren't down here
just to look.
658
00:55:09,680 --> 00:55:13,520
'We also wanted to collect samples
for deep reef scientists...
659
00:55:15,520 --> 00:55:18,439
'..and that proved
easier said than done.'
660
00:55:18,440 --> 00:55:21,479
Oh, no!
We have to go and fetch that.
661
00:55:21,480 --> 00:55:22,800
We'll take that on film.
662
00:55:25,200 --> 00:55:27,999
'As we descended beyond 250 meters,
663
00:55:28,000 --> 00:55:31,520
'we entered a landscape rarely
seen with the naked eye.
664
00:55:33,920 --> 00:55:37,160
'It was the perfect opportunity
simply to explore.'
665
00:55:38,520 --> 00:55:40,959
This is the first time
that manned submersibles
666
00:55:40,960 --> 00:55:42,599
have worked at this depth
667
00:55:42,600 --> 00:55:45,319
and it gives one the ability
to look and observe
668
00:55:45,320 --> 00:55:48,279
and just do curiosity-driven
research.
669
00:55:48,280 --> 00:55:50,119
It's fantastic.
670
00:55:50,120 --> 00:55:52,919
The visibility down here
spectacular, isn't it?
671
00:55:52,920 --> 00:55:55,199
It's absolutely pure, yeah.
672
00:55:55,200 --> 00:55:58,439
There were many times when I had to
take my eye away from the eyepiece
673
00:55:58,440 --> 00:56:01,279
because I just had to
look with my own eyes,
674
00:56:01,280 --> 00:56:03,999
so it goes into the brain properly
675
00:56:04,000 --> 00:56:05,560
in the right perspective.
676
00:56:07,360 --> 00:56:09,600
'Soon, we reached our target depth.'
677
00:56:12,640 --> 00:56:14,080
There it is. 300.
678
00:56:15,760 --> 00:56:21,279
Nobody before has ever been as deep
as this on the Great Barrier Reef.
679
00:56:21,280 --> 00:56:22,799
I like it.
680
00:56:22,800 --> 00:56:25,479
LAUGHTER
681
00:56:25,480 --> 00:56:28,199
So, it hasn't even come up
on here - 290 meters,
682
00:56:28,200 --> 00:56:31,159
but we've heard that they've
just reached 300 meters.
683
00:56:31,160 --> 00:56:34,759
Another thing to add to the things
that David's done on this planet.
684
00:56:34,760 --> 00:56:37,039
'The purpose of our
record-breaking trip
685
00:56:37,040 --> 00:56:40,919
'was to raise awareness
of the reef's fragility.
686
00:56:40,920 --> 00:56:44,159
'Fortunately, while production
continued on the series,
687
00:56:44,160 --> 00:56:46,960
'the dive caught
the attention of a president.'
688
00:56:48,160 --> 00:56:52,599
Mr President.
When I heard that you had gone down,
689
00:56:52,600 --> 00:56:55,280
you dove into
the Great Barrier Reef again...
690
00:56:56,920 --> 00:56:58,759
...60 years after the first time
you did it?
691
00:56:58,760 --> 00:57:00,399
Yes. That impressed me.
692
00:57:00,400 --> 00:57:02,839
Ah, but I was in a sub.
693
00:57:02,840 --> 00:57:05,439
I mean, I was in a very,
very remarkable research sub
694
00:57:05,440 --> 00:57:07,679
and we went down to over 300 meters.
695
00:57:07,680 --> 00:57:09,919
Oh, so you went really deep.
696
00:57:09,920 --> 00:57:11,840
And that was just mind-blowing.
697
00:57:13,080 --> 00:57:16,839
The deep dive proved
a truly memorable moment for me
698
00:57:16,840 --> 00:57:19,959
and allowed us the unique
opportunity of revealing
699
00:57:19,960 --> 00:57:23,440
a part of this great reef
that has never before been seen.
59512
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