than most of us realize.

If you were to shave off all of the land

from the tops of every continent and island in the world

and fill up the ocean's deepest points with that land,

then the entire earth would be covered

in an ocean 2 miles deep.

Three fourths of our planet is already

covered in water though, and it goes a lot deeper

than just two miles.

Let's start with a sense of scale.

This dot right here is the size of an average human.

This slightly larger dot is the size of an elephant.

And this is the size of the largest ship ever built,

the Knock Nevis.

With that in mind, let's start going under water

and see what we find out.

The first milestone is at 40 meters

below the surface, which is the maximum depth allowed

for recreational scuba diving.

A little further down at 93 meters

is where the wreck of the Lusitania was discovered,

which is interesting because the Lusitania

itself is 240 meters long, which means

that it sank in water shallower than it is long.

So if the ship was standing on its stern or bow,

it would be sticking out of the water.

Just slightly deeper than that at 100 meters

is where diving can become seriously fatal if you're not

careful because of decompression sickness.

But that didn't stop a man named Herbert Nitsch to accomplish

the free diving world record at a depth of 214 meters.

This guy swam down to this level with just one single breath.

But a little further down at 332 meters,

we have the scuba diving world record

which was accomplished by another man named Ahmed Gabr.

If he had swam down another 111 meters then

he would have reached the height of the Empire State Building

if it was submerged under water.

And a little further than that at 500 meters

below the surface, we arrive at the maximum dive

depth of Blue Whales, the largest creatures on the planet

and also the limit of the US Seawolf Class Nuclear

Submarine.

At 535 meters we can witness the maximum dive

depth of Emperor Penguins.

And this is one we must bring up the intensity of water

pressure.

At this level below the surface, the water pressure

exerted on a person or the penguins

would be roughly equivalent to a polar bear

standing on a quarter.

So further down the depths at 830 meters

would be the height of the Burj Khalifa in Dubai, the tallest

building in the world.

Once we hit 1,000 meters below the surface,

we begin to enter the scary zone.

Light from the surface can no longer reach beyond this point,

so the rest of the ocean below is

shrouded in permanent darkness.

On top of that, the water pressure

you would experience at this point would be about the same

as if you were standing on the surface of the planet Venus,

meaning that you would die very quickly.

You would also meet the Giant Squid at this sea level

if the water pressure didn't already kill you.

At 1,280 meters we reach the maximum depth dived to

by the Leatherback Sea Turtle.

And further down at 1,828 meters we

would reach the deepest part of the Grand Canyon

were it to be underwater with us.

Down at 2,000 meters, we start to encounter some of the more

terrifying sea creatures like the ominously named

Black Dragonsih, a carnivorous beast with a stomach that

doesn't allow light to be emitted through it.

Meaning that since we are in total darkness underwater

at this point, the only way you would ever see this thing

is with a flashlight.

A little further down at 2,250 meters

we would reach the maximum depth dived to

by both Sperm Whales and the very frightening Colossal

Squid.

Sperm Whales often have sucker marks and scars

left on their bodies from battles with the Colossal Squid

that likely take place at these incredible depths.

The squids themselves can grow to be 14 meters long

and weigh up to 750 kilograms with eyes

the size of a dinner plate and razor-sharp sickles

in the middle of their tentacles.

So yeah, good luck with that down there.

Way further down at 3,800 meters we

can find the wreck of the RMS Titanic.

And a bit past that at 4,000 meters,

we start to enter the Abyssal Zone of the ocean.

Water pressure is at an astonishing 11,000 pounds

per square inch down here.

And there are numerous strange, almost

alien like creatures that inhabit these depths,

such as the Fing Tooth, Angler Fish, and Viper Fish.

Down at 4,267 meters is the average depth

of the ocean where you would normally

expect to hit the floor.

But there are parts of the ocean that go significantly deeper

than even this.

At 4,791 meters rests the wreckage of the battleship

Bismarck, sunk during World War II.

And way down at 6,000 meters is the beginning

of the Hadal Zone, named after the underworld Hades, itself.

The water pressure down at these depths

can become 1,100 times what you would experience

way back on top at the surface, which

is roughly equal to an elephant balancing on a postage stamp,

or a single person carrying the weight of 50 Boeing 747

jumbo jets.

Down at these depths, you would be crushed immediately

without any outside protection.

But life still exists down here in various strange forms.

At 6,500 meters we reach the maximum depth

that the DSV Alvin can dive to, a popular research

submarine that helped to discover the Titanic.

Way further down at 8,848 meters below the surface and we have

arrived at the height of Mt.

Everest, were it to be upside down and placed underwater.

And then way further past even that at 10,898 meters,

we arrive at the depth reached by James Cameron in 2012

during the Deep Sea Challenger Mission.

The deepest point of the ocean yet reached by humans

was back in 1960 though, when two men

named Don Walsh and Jacques Piccard reached

a depth of 10,916 meters using their [? Trieste ?] submarine.

It took them five hours to descend through the ocean

to this depth.

And they only stayed for 20 minutes

before a window cracked and they began to resurface.

Just a bit further down from there

at 10,972 meters and we've reached the average flight

altitude of a commercial airliner.

So if you've ever looked out of a window while on a flight

and looked down to the ground, that's

a very good sense of how incredibly

deep down into the abyss that we are currently at.

Finally, when we hit 10,994 meters

we have hit the bottom of the known ocean,

called the Challenger Deep, right here on this map

just about 300 kilometers southwest of Guam Island.

However, it is believed that there are almost certainly

even deeper parts of the ocean than this that just

haven't been discovered yet.

It wasn't until 1997 after all that

the Sirena Deep was discovered with a depth of 10,732 meters,

making it the second deepest known point in the ocean.

It is estimated that only about 5% of the ocean's floor

has been accurately mapped, leaving the other 95% to be

currently a mystery.

It may be only a matter of time before an even deeper part

of our ocean is found.

And who knows what we may discover there.

So thank you for taking the time to watch this video.

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