YT YouTube2Text

YouTube2Text → Transcripts → The Lost Oceans of Earth: The Ancient Seas Our Planet Swallowed | Full Documentary

The Lost Oceans of Earth: The Ancient Seas Our Planet Swallowed | Full Documentary — Transcript

by WUFO TV · 4,114 words · 865 segments · language en · Watch on YouTube

Open in transcriber Summarize with AI Download SRT/VTT

Full transcript

0:07Throughout Earth's history, vast oceans
0:10spanning [music] tens of millions of
0:11square kilometers
0:13existed for hundreds of millions of
0:15years.
0:17But eventually, they disappeared. Not
0:20because they evaporated [music] or
0:22escaped into space, but because they
0:25were swallowed by the planet itself.
0:29Today, evidence of their existence
0:31[music]
0:32still remains preserved within fossils,
0:35ancient rock [music] layers, and deep
0:37beneath the highest mountain ranges on
0:39Earth.
0:40What were these [music] oceans?
0:42And what happened to them?
0:45This is the story of the forgotten
0:47oceans of prehistoric Earth.
0:52Around 4.4 billion years ago,
0:55Earth was still a young world that had
0:57only [music] recently emerged from a
0:59violent period of formation.
1:01Its surface [music] had once been an
1:03ocean of molten lava,
1:05constantly bombarded by massive
1:07meteoroids.
1:13But then, something remarkable happened.
1:16As the planet gradually cooled,
1:19water vapor in the atmosphere began to
1:21condense. [music]
1:27The rains that followed did not last for
1:30days or months,
1:32but potentially for millions of years.
1:34Water accumulated in the first
1:36depressions of Earth's crust,
1:39forming the earliest primordial oceans
1:41in the history of the planet.
1:46Ancient zircon crystals discovered in
1:49Western Australia [music]
1:51have provided evidence that liquid water
1:53may have existed on Earth as early as
1:554.4 billion years ago.
2:02It is a stunning discovery because it
2:04pushes the history of the seas back
2:06hundreds of millions of years earlier
2:08than scientists [music] once believed.
2:11But what is even more remarkable is that
2:13most of Earth's history looked nothing
2:15like the world we live in today.
2:23It was a [music] world so strange that
2:25it is difficult for us to imagine.
2:28Today, about 71% of Earth's surface is
2:32covered by water.
2:36And within those seemingly empty waters,
2:39the most important event in Earth's
2:41history may have begun to unfold.
2:44In the primordial seas, rich with
2:47dissolved minerals,
2:49simple organic molecules
2:51may have linked together [music] to form
2:53increasingly complex structures.
2:59Some modern hypotheses focus on
3:02hydrothermal vents deep beneath the
3:05ocean floor,
3:06where mineral-rich hot water
3:08continuously erupts from Earth's crust.
3:12Here,
3:12>> [music]
3:12>> energy and chemical gradients exist that
3:15may have been sufficient to drive the
3:17reactions that produced the first
3:19molecules of life.
3:26The first oceans did not merely give
3:27birth to life.
3:34They also created something that would
3:35completely transform the history of the
3:38planet, competition.
3:40And as life became more diverse,
3:43the seas were no longer peaceful.
3:49They began to evolve into a world of
3:51predation,
3:53defense, and relentless evolution.
3:56The earliest organisms were preparing to
3:58trigger a biological revolution unlike
4:01anything before it.
4:04An explosion that would produce eyes,
4:07jaws, armor, and the first predators in
4:10history.
4:11The ocean was no longer simply a vessel
4:14containing life. It was about [music] to
4:16become the most powerful engine of
4:18evolution Earth had ever known.
4:24After billions of years existing as a
4:26world of simple microorganisms,
4:30the ancient ocean began to produce one
4:32of [music] the greatest turning points
4:34in the history of life.
4:35Around 541
4:38million years ago,
4:40during a relatively brief period on the
4:42geological time scale,
4:45the ocean suddenly became the [music]
4:46stage for an unprecedented evolutionary
4:49explosion.
4:55Today, this event is known as the
4:58Cambrian explosion.
5:00What happened beneath those ancient
5:02waters?
5:04For the first time in Earth's history,
5:07organisms were no longer simply
5:09existing. They began competing with one
5:11another.
5:17And once competition appeared, evolution
5:19accelerated.
5:21One of the most important [music]
5:23inventions of the Cambrian ocean was the
5:25eye.
5:29Before this time, most organisms sensed
5:32their environment through chemicals or
5:34simple vibrations.
5:36But when some species began developing
5:38primitive visual organs,
5:41the entire world changed.
5:47Studies of trilobites show that some
5:49species possessed [music] compound eyes
5:52containing thousands of tiny calcite
5:54lenses.
5:56One of the most sophisticated visual
5:58systems ever known in the fossil record.
6:01Once organisms gained the [music]
6:03ability to see,
6:04they began pursuing one another.
6:13And this may have been the first time in
6:15planetary history that the concept of a
6:17[music] predator emerged.
6:19One of the most famous icons of this era
6:22was Anomalocaris.
6:27Measuring about 1 m in length, enormous
6:30by Cambrian standards,
6:32it possessed front appendages used to
6:34seize prey
6:36and a circular mouth lined with sharp,
6:39hardened plates.
6:44But when predators emerged, prey began
6:47to change as well.
6:49For the first time in evolutionary
6:51history,
6:53armor became a critical survival
6:55advantage.
7:01Hard calcium shells, sharp spines,
7:04and defensive structures began appearing
7:07throughout the oceans.
7:09Trilobites developed segmented armor
7:11that protected their bodies.
7:17Many other organisms evolved complex
7:20exoskeletons to resist attacks.
7:23A biological arms race had begun.
7:26And remarkably, all of this unfolded
7:29underwater.
7:34One famous example is Opabinia,
7:37a creature about 7 cm long that
7:40possessed [music] five eyes and a
7:42flexible proboscis extending from the
7:45front of its body.
7:51Every factor seemed to converge
7:54creating the conditions necessary for
7:56complex life to flourish.
7:58And from this point forward emerged a
8:01pattern that would follow the entire
8:03history of Earth.
8:04Every evolutionary innovation brings a
8:07new threat.
8:12Eyes evolved to see, but they also made
8:16organisms visible.
8:18Armor protected the body,
8:21but it drove predators to develop
8:23stronger jaws.
8:28Speed increased, but so did the demand
8:31for more relentless pursuit. [music]
8:34The ocean invented complex life,
8:36but at the same time, it also invented
8:39fear, competition,
8:42and the first struggle for survival on
8:44the planet.
8:50Between approximately 485
8:53and 359
8:55million years ago,
8:57spanning the Ordovician through the
8:58Devonian periods,
9:00the oceans entered a phase that many
9:02paleontologists describe as Earth's
9:04first arms race.
9:06This was no longer a world of simple,
9:09slow-moving creatures crawling across
9:12the seafloor.
9:17Beneath the Ordovician oceans around 450
9:21million years ago,
9:23the dominant rulers were giant
9:24cephalopods known as Endoceras.
9:31These were distant relatives of modern
9:33octopuses [music]
9:33and squids,
9:35but their size was on an entirely
9:37different scale.
9:39Some fossils suggest that Endoceras
9:41could reach lengths of 5 to more than 9
9:44m.
9:50Its long conical shell functioned like a
9:52biological submarine.
9:55While the tentacles [music] at the front
9:56served as tools for seizing any creature
9:59unfortunate enough to pass [music] by.
10:07But, Endoceras was only the opening
10:09chapter.
10:10As time advanced into the Silurian and
10:13Devonian periods,
10:15another group of organisms began rising
10:17to dominate the seas. [music]
10:20Eurypterids, better known as sea
10:22scorpions,
10:28some of the largest species, such as
10:30Jaekelopterus,
10:32could reach lengths of about 2.5 m.
10:35Although they were not true scorpions,
10:38they were gigantic arthropods equipped
10:41with long pincers lined with sharp
10:43spines.
10:46But, what is truly remarkable is the
10:48speed at which biological weapons
10:50evolved.
10:52Fossils reveal that many marine
10:54organisms began developing thicker
10:56shells,
10:57sharper spines,
10:59and more effective burrowing abilities.
11:07Then, around 380 million years ago,
11:12one of the most terrifying
11:13superpredators in history appeared,
11:16Dunkleosteus.
11:18Unlike modern fish, it did not possess
11:21teeth in the conventional sense.
11:26Instead, the front of its jaws was
11:29formed from bladelike [music] bony
11:31plates.
11:32Its body length may have reached between
11:356 and nearly 9 m.
11:42Why did all of these monsters emerge
11:45during nearly the same period?
11:50As oxygen levels in the oceans
11:52increased, as food became more abundant,
11:56and as ecosystems grew more complex, the
11:59energy available to life increased as
12:02well.
12:03This allowed organisms to develop larger
12:05bodies,
12:07more sophisticated nervous systems,
12:10and more effective [music] hunting
12:11strategies.
12:18Food webs grew more dependent upon one
12:20another.
12:22Giant super predators required enormous
12:24amounts of food.
12:26Even a small environmental change could
12:29trigger a chain reaction on a global
12:31scale.
12:37At the very moment the oceans reached
12:39the height of their power,
12:42they also began moving closer to an
12:44unprecedented crisis.
12:46Ocean currents were changing.
12:49Continents were shifting, and on the
12:51horizon of planetary history,
12:54a silent catastrophe was beginning to
12:56take shape.
13:02The ocean had once been the most
13:04dangerous battlefield on Earth.
13:07But for the first time in hundreds of
13:08millions of years,
13:10the seas were beginning to suffocate.
13:19After hundreds of millions of years of
13:21explosive evolution,
13:23Earth's oceans seemed to have reached
13:25the height of their power.
13:27Giant predators dominated the food
13:29chain.
13:35Marine ecosystems stretched from shallow
13:37coastal waters to the dark abyssal
13:39depths offshore.
13:41Life existed in nearly every corner of
13:44the ocean.
13:49Toward the end of the Devonian period
13:52and into the Carboniferous and Permian
13:54periods,
13:55Earth's continents began colliding with
13:57one another. Over tens of millions of
14:00years, enormous tectonic plates
14:03continuously shifted,
14:05eventually forming the supercontinent
14:07Pangea.
14:13This was a vast landmass stretching from
14:15the North Pole to the South Pole,
14:18covering most of the planet's exposed
14:20land.
14:22Oceans are not simply bodies of still
14:24water.
14:30They operate through immense ocean
14:32currents that transport [music] heat,
14:34oxygen,
14:35and nutrients across the planet.
14:42But when Pangea formed,
14:44the shape of the ocean basins changed
14:46completely.
14:48Water circulation pathways that had
14:50existed for hundreds of millions of
14:52years were disrupted or [music]
14:54distorted.
14:57As water movement slowed,
14:59dissolved oxygen levels dropped
15:01dramatically across many marine regions.
15:05Deep waters that were already
15:07oxygen-poor became nearly incapable of
15:09supporting life.
15:16Scientists refer to this phenomenon as
15:20anoxia,
15:21a large-scale depletion of oxygen.
15:28The Gulf of Mexico contains a seasonal
15:31dead zone
15:32spanning thousands of square kilometers
15:36where oxygen concentrations become so
15:39low that many fish and marine animals
15:42must [music] flee or suffocate. But
15:44during the late Paleozoic,
15:47such dead zones did not appear in just
15:49one region.
15:55They expanded across the globe.
15:57Beneath the surface, these changes
15:59unfolded almost silently.
16:02By this time, marine ecosystems had
16:05become extraordinarily complex [music]
16:07after hundreds of millions of years of
16:09evolution. Apex predators depended on
16:12stable food supplies.
16:18Filter-feeding organisms depended on
16:21microbial plankton communities.
16:24The entire web of life was
16:25interconnected like a vast machine.
16:35And when one component began to fail,
16:38a domino effect immediately followed.
16:41Fossils from the late Devonian reveal
16:43that many groups of marine organisms
16:46that had once been highly successful
16:48[music] began to decline dramatically.
16:50Ancient coral reefs collapsed.
16:53Numerous armored species disappeared.
17:01Ecosystems that had remained stable for
17:03tens of millions of years began losing
17:06their balance.
17:08As the supercontinent Pangea formed,
17:11much of the continental interior lay far
17:13from the oceans.
17:19Paleo models suggest
17:22that many regions may have experienced
17:24longer and more severe heat waves than
17:26before.
17:27This further reduced the ocean's ability
17:29to retain dissolved oxygen
17:32because the warmer the water becomes
17:35the less oxygen it can hold.
17:42The ocean was falling into a dangerous
17:44spiral.
17:46This was a pivotal moment in Earth's
17:48history.
17:54For the first time, the ocean
17:57the environment that had created life
18:00nurtured life
18:02and driven every major biological
18:04revolution [music]
18:06was beginning to become hostile to the
18:08very organisms living within it.
18:14Around 252
18:16million years ago
18:18Earth entered the darkest chapter in the
18:20entire history of life.
18:23This was the Permian-Triassic extinction
18:25event
18:27known to scientists as the Great Dying.
18:35Within a relatively short span of
18:36geological time
18:38between 90 and 96% of all marine species
18:42vanished [music] from the planet.
18:44Nearly the entire aquatic world of Earth
18:46collapsed simultaneously.
18:52In what is now Siberia, one of the
18:54largest [music] volcanic eruptions ever
18:56known began to unfold.
18:58We call it the Siberian Traps.
19:06For hundreds of thousands of [music]
19:08years, lava erupted continuously
19:12covering an area of approximately
19:13[music]
19:147 million square kilometers.
19:20But lava was not the most dangerous
19:21threat. [music]
19:23Each eruption released enormous
19:25quantities of carbon dioxide, methane,
19:27[music]
19:28and other greenhouse gases into the
19:30atmosphere.
19:36Global temperatures began to rise.
19:39Oxygen isotope studies suggest that
19:42ocean surface temperatures may have
19:44increased by 8 to more than 10° [music]
19:46C.
19:52In tropical regions,
19:54seawater [music] temperatures may have
19:55exceeded 35° C.
20:02Ancient corals [music] disappeared.
20:05Reef ecosystems collapsed.
20:07Food chains [music] broke apart from the
20:09bottom to the top, but the catastrophe
20:12did not end there.
20:14Something even [music] more terrifying
20:16emerged from the seafloor.
20:22As oxygen levels were [music] depleted,
20:24anaerobic bacteria flourished.
20:27They produced hydrogen sulfide,
20:30an extremely toxic [music] gas with the
20:32smell of rotten eggs.
20:38In the modern world, concentrations of
20:41only a few hundred parts per million can
20:43be lethal.
20:45But during the late Permian, many
20:47scientists believe this poisonous gas
20:49may have accumulated on a global scale.
20:58Some models even suggest that clouds of
21:00hydrogen sulfide escaped from the oceans
21:02and spread into the atmosphere.
21:05Evidence of this catastrophe remains
21:07preserved in rock layers across the
21:09world. [music]
21:15From China, Greenland, and South Africa
21:18to Australia,
21:20geologists have discovered the same
21:22signature.
21:24A thin boundary within the geological
21:26record where biodiversity collapsed
21:28almost instantly.
21:36What makes the Permian [music]
21:37extinction unique is not only the number
21:39of organisms that disappeared,
21:42but also the astonishingly slow pace of
21:45recovery.
21:47After the catastrophe ended, Earth
21:49required nearly 5 to 10 million years
21:52for marine ecosystems [music] to regain
21:54even a relatively stable level of
21:56diversity.
21:59In the history of the planet,
22:01that is a span of time almost impossible
22:04to comprehend.
22:06And then, amid the silence that followed
22:08the apocalypse,
22:10a new ocean began to emerge as the
22:12center of the world.
22:18The surviving organisms evolved into
22:21entirely different forms of [music]
22:22life.
22:24New predators appeared.
22:26New ecosystems were built from the ruins
22:29of the old world.
22:31From the ashes of the great dying, a
22:34geological legend was beginning to take
22:36shape.
22:39Around 250 million years ago,
22:43as the supercontinent Pangea began to
22:45take shape,
22:47a vast body of water emerged between the
22:49enormous landmasses,
22:51stretching from what is now Europe,
22:53North Africa, and the Middle East all
22:56the way to Asia.
22:58This was the Tethys Ocean.
23:05>> For tens of millions of years that
23:07followed, Tethys was more than just a
23:09body of water.
23:11It became the center of life on the
23:13planet.
23:15Within the waters of Tethys,
23:17new predators began to dominate.
23:24Ichthyosaurs emerged as the giant
23:26dolphins of the prehistoric world.
23:29Some species exceeded 15 m in length
23:32>> [music]
23:33>> and possessed streamlined hydrodynamic
23:36bodies that allowed them to swim at
23:38remarkable speeds.
23:43Studies of their eye structure suggest
23:45that certain ichthyosaurs had eyeballs
23:48larger than a soccer ball,
23:50enabling them to hunt in dark waters
23:52hundreds of meters beneath the ocean
23:54surface.
23:55But ichthyosaurs were not the only
23:58inhabitants.
24:05Tethys was also home to plesiosaurs,
24:08creatures with bizarrely long necks that
24:10continue to appear in countless legends
24:13of lake monsters today.
24:15Some species possessed more than 70 neck
24:18vertebrae.
24:23Their elongated necks functioned [music]
24:25like flexible hunting arms,
24:27allowing them to approach prey without
24:29bringing their entire [music] bodies
24:31close.
24:32Then, tens of millions of years later, a
24:35new power emerged.
24:40Mosasaurus, giant marine lizards capable
24:43[music] of reaching lengths of 10 to 15
24:45m.
24:47Their sharp, inward-pointing [music]
24:49teeth
24:50made escape nearly impossible once prey
24:52had been bitten.
24:55Fossil evidence shows that
24:57hunted large fish,
25:00other marine reptiles,
25:02and sometimes even members of their own
25:04species.
25:06During the late Cretaceous, they became
25:08the true rulers of Tethys.
25:13Around 100 million years ago, the
25:16African [music] plate and the Indian
25:18plate began moving northward.
25:21The Tethys Ocean, positioned between
25:23these enormous landmasses,
25:25gradually began to close.
25:32And then, an ocean became a mountain
25:34range. Today, when standing before the
25:38Himalayas rising more than 8,000 m into
25:41the sky,
25:42very few people realize they are looking
25:44at the [music] remnants of an ancient
25:46seafloor.
25:50On the slopes of the highest mountains
25:52in the world,
25:54geologists [music] have discovered
25:55marine fossils, seashells, and limestone
25:59layers that formed underwater,
26:01even near the summit of Mount Everest,
26:04standing 8,849
26:07m above sea level.
26:09There are rock layers that once rested
26:12[music] beneath the floor of the Tethys
26:13Ocean hundreds of millions of years ago.
26:21The same story unfolded elsewhere.
26:25The Sahara Desert, now one of the driest
26:27[music] places on Earth,
26:29was once part of the floor of the Tethys
26:31Ocean.
26:37Many regions across the Middle East,
26:39Turkey, Iran,
26:41and Southern Europe [music] preserve
26:43fossils of creatures that once swam
26:46through these waters.
26:48Each layer of rock is a page from the
26:50diary of a lost world.
26:53Tethys never truly disappeared.
26:56It simply changed its form.
27:03If Tethys was the legendary ocean of
27:05life,
27:06there was another ocean that surpassed
27:08it in scale, so vast that it covered
27:11nearly the entire planet.
27:14It was Panthalassa,
27:16the largest ocean ever to exist [music]
27:18in the history of Earth.
27:24Around 300 million years ago, when all
27:27of Earth's continents merged into the
27:29supercontinent Pangea,
27:32the rest of the planet was covered by a
27:34single immense body of water.
27:41Modern geological models suggest that
27:43Panthalassa covered more than 70% of
27:46Earth's surface at the time,
27:49with a diameter that may have exceeded
27:5120,000 km.
27:57Massive waves could travel continuously
27:59for weeks without encountering a single
28:01geographic [music]
28:02barrier.
28:03Climatologists suggest that storms on
28:06Panthalassa may have grown larger than
28:08any storm system on modern Earth,
28:11>> [music]
28:11>> because no continent was large enough to
28:13stop them.
28:19If this was the largest ocean that ever
28:21existed, [music]
28:23why do we know so little about it?
28:25For hundreds of millions of years, the
28:28seafloor of Panthalassa was continuously
28:30[music]
28:31pulled beneath continental plates and
28:33recycled deep into Earth's mantle.
28:38Most modern ocean floors [music] are
28:40younger than 200 million years old,
28:44while Panthalassa existed [music]
28:45for far longer.
28:48That means nearly the entire [music]
28:49floor of this ancient ocean has been
28:52recycled into the interior of the
28:53planet.
28:59Modern science has uncovered remarkable
29:02clues.
29:04Some ancient volcanic islands in Japan,
29:07>> [music]
29:07>> New Zealand, British Columbia, and
29:10Alaska contain fragments of rock that
29:13once belonged to the floor of
29:15Panthalassa.
29:22Microfossils of marine organisms
29:24discovered within these rocks
29:27revealed the ocean was home to countless
29:29planktonic organisms, mollusks,
29:32and vast marine ecosystems.
29:40Geochemical and geophysical [music]
29:42models also suggest
29:45that certain regions of Panthalassa may
29:48have been deeper than most modern
29:50oceans.
29:51When we look into deep trenches [music]
29:53such as the Mariana Trench today,
29:55reaching depths of nearly 11 km,
29:58we are catching a glimpse of conditions
30:00that may once have existed on an even
30:02larger scale within Panthalassa.
30:09And then there is a fact that makes
30:11everything even more overwhelming.
30:14Earth slowly swallowed it from within.
30:21Millions of square kilometers of
30:23seafloor sank into the mantle hundreds
30:26of kilometers [music] below the surface.
30:29All that remains are a few scattered
30:31fragments of [music] rock spread across
30:33modern continents.
30:37Panthalassa stands as the most powerful
30:40reminder of an astonishing truth.
30:43Even the largest structures on a planet
30:45do not last forever.
30:52Following the story of the immense
30:54oceans that vanished from Earth's
30:56surface,
30:57the journey begins with a mineral whose
30:59name is unfamiliar to most people,
31:02ringwoodite.
31:04This is a high-pressure form of the
31:05mineral olivine,
31:07created only under extremely harsh
31:09conditions at depths
31:11between approximately 410
31:14and 660 km beneath Earth's surface,
31:18in a region known as the mantle
31:20transition zone.
31:26A diamond [music] excavated in Brazil
31:28contained a natural ringwoodite crystal.
31:32What made this crystal [music]
31:33extraordinary was that it contained
31:35approximately 1.5%
31:38water [music] by weight.
31:39Not liquid water,
31:41but hydroxyl ions locked within the
31:43crystal structure itself.
31:49Could it be that most of Earth's water
31:51[music]
31:52is not actually contained within the
31:54oceans we see on the surface?
31:57Seismologists have used thousands of
31:59sensors around the world to track
32:01seismic [music] waves generated by
32:03earthquakes.
32:09As seismic waves travel through
32:11different layers of rock,
32:13their speeds change depending on the
32:15materials they pass through.
32:18The data revealed that the mantle
32:19transition zone possesses
32:21characteristics consistent with the
32:23presence of enormous quantities of water
32:26stored within minerals.
32:33Rather than existing as liquid,
32:36the water is trapped as molecular
32:38components within crystal lattices of
32:40rock [music] at temperatures exceeding
32:421,000°C
32:45and under pressures tens of thousands of
32:47times greater than atmospheric pressure.
32:51This discovery helps solve a mystery
32:53that has puzzled scientists for decades.
32:55[music]
33:02Researchers have long wondered why
33:04Earth's water supply appears to have
33:06remained relatively stable for billions
33:08of years,
33:10even though tectonic plates continuously
33:12transport water deep into the planet
33:14through subduction every year.
33:17Hundreds of millions of tons of water
33:19>> [music]
33:20>> are carried into Earth's interior along
33:22descending oceanic plates.
33:28If this process [music] had continued
33:30uninterrupted for billions of years,
33:33Earth's oceans should have disappeared
33:35long ago.
33:37Yet, that did not happen.
33:44One possible explanation is that Earth
33:47possesses a vast [music] deep-water
33:48cycle
33:50in which water is continuously stored,
33:53recycled,
33:54and eventually returned to the surface
33:57through volcanic activity.
34:00And then an even more astonishing
34:01[music] idea emerges.
34:07Perhaps ancient oceans did not
34:09completely disappear when ocean [music]
34:11basins closed.
34:13Some of their water may have been pulled
34:15into the mantle through subduction
34:17[music] zones
34:18and may still reside hundreds of
34:20kilometers beneath our feet today.
34:27In a sense, those forgotten oceans may
34:29still exist.
34:31They simply exist in an entirely
34:34different form.
34:40After [music] exploring the oceans that
34:41were pulled down into Earth's mantle,
34:44a question naturally follows.
34:47How do we know those oceans ever
34:48existed?
34:50The answer lies in traces preserved
34:53within rock. Every layer of rock is a
34:55page of documentation.
34:58Every fossil is a written note.
35:05And when all of those pieces are
35:06assembled together,
35:08we can read the history of oceans that
35:11have long since disappeared.
35:13One of the most compelling pieces of
35:15evidence is found in places that seem
35:18impossible to connect with [music] the
35:19sea.
35:24Imagine standing on the summit of Mount
35:26Everest, the highest point on the
35:28planet,
35:30rising approximately 8,849
35:34m above sea level.
35:36Around you are ice, snow, thin air, and
35:40towering cliffs.
35:44It appears to be the last place on Earth
35:46that could have any connection to an
35:48ocean.
35:49Yet, geologists have discovered
35:51countless fossils of ancient marine
35:53organisms within the rocks of Everest,
35:57including brachiopods, crinoids,
36:00and creatures that lived on the seafloor
36:02hundreds of millions of years ago.
36:08That evidence leads to only one
36:10astonishing conclusion.
36:12The rocks that form the summit of
36:14Everest once rested beneath the floor of
36:16the Tethys Ocean.
36:18But fossils are not the only evidence.
36:26Scientists also rely on a very special
36:29type of rock [music] known as limestone.
36:32Most limestone forms from the
36:34accumulated remains of countless tiny
36:36marine organisms
36:38that settle on the seafloor over
36:40millions of years.
36:46When geologists find limestone layers
36:49hundreds of meters thick in the middle
36:51of the Sahara Desert
36:53or deep within the interior of Central
36:55Asia,
36:56they know those regions were once
36:58covered by seawater.
37:00Limestone serves as a surviving
37:02photograph of ancient oceans,
37:05preserving marine environments from
37:08hundreds of millions of years ago.
37:14Yet, there is an even stranger form of
37:16evidence known as ophiolite.
37:19These are fragments of oceanic crust and
37:21upper mantle that were pushed onto land
37:24instead of sinking into Earth's
37:26interior.
37:31Normally, ocean floors are recycled
37:33through subduction,
37:35causing most oceanic history to
37:38disappear.
37:40Thanks to ophiolite formations in Oman,
37:43Cyprus, and many other locations,
37:46scientists can directly study rocks that
37:48once lay beneath the floors of ancient
37:50oceans.
37:54But, the true revolution came from
37:56seismology.
37:58Today,
37:58>> [music]
37:58>> every earthquake generates seismic waves
38:01that travel through the planet.
38:06What is extraordinary is that all of
38:08these lines of evidence tell the same
38:10story.
38:11Fossils on mountaintops,
38:13limestone in deserts,
38:16ophiolites on continents, magnetic
38:18signatures preserved in rock,
38:21and seismic images from [music] deep
38:22within Earth all point to a single
38:24conclusion, vast oceans truly existed,
38:27flourished, and eventually disappeared
38:30as part of the planet's ongoing cycle.
38:37The oceans of prehistoric Earth did not
38:39truly disappear.
38:42They simply continued [music] to change
38:43shape under the forces of plate
38:45tectonics, continental drift,
38:48and the passage of geological time.
38:54They not only shaped the continents
38:57and preserved [music] invaluable records
38:59within rock layers and fossils buried
39:01deep beneath the surface,
39:03but more importantly, they served as the
39:06cradle where the first organic compounds
39:08were assembled.
39:14Studying these forgotten oceans helps us
39:17realize that the modern oceans are also
39:20only a temporary moment in Earth's
39:22history,
39:23while at the same time providing a
39:25scientific key to mapping the potential
39:27locations of life throughout the
39:29universe.
39:35Because in our search for habitable
39:37planets beyond [music] Earth,
39:39if we hope to understand the future of
39:41distant worlds,
39:43we must first understand the vanished
39:45oceans that lie beneath our own feet.
40:47>> Thank you for staying with Woeful space
40:49until the very end of this journey
40:50through the vast universe. If you found
40:53this video interesting and insightful,
40:55don't forget to like, share, and
40:57subscribe to Woeful space so you won't
40:59miss our next cosmic adventures. Your
41:02support means the world to us and fuels
41:04our passion to keep exploring the
41:06wonders beyond.

About this transcript

This page contains the full transcript of The Lost Oceans of Earth: The Ancient Seas Our Planet Swallowed | Full Documentary by WUFO TV, generated from the public captions YouTube serves with the video. The transcript has 4,114 words across 865 segments, with the original timestamps preserved so you can click any line to jump to that moment in the embedded player.

What you can do with it

Use the transcript to take notes, quote the speaker, build a study guide, generate a summary with ChatGPT or Claude via the YouTube Summary tool, or export it as a timed subtitle file with YouTube to SRT. You can also re-open it in the transcriber to translate the transcript into 100+ languages.

Free YouTube transcript tool

YouTube2Text is a free YouTube transcript generator — no signup, no daily limit. Paste any YouTube link and get the full transcript instantly, with timestamps, click-to-jump, translation to 100+ languages, AI prompts for ChatGPT, Claude, and Gemini, and exports to TXT, SRT, VTT, or Markdown.