These still waters hide

a 20 million year death match

between two prehistoric monsters.

Grab some popcorn and a snorkel.

You have a front-row seat for

the ultimate aquatic showdown

between the megalodon shark

and the Leviathan whale.

Twenty million years ago,

these creatures dominated the oceans,

and they may have fought before that.

Although they're long gone,

you can still see the remains

of these giants in their descendants.

Just look at the sperm whale,

which descended from its toothed ancestor.

Even this monster doesn't

compare in size to the Leviathan.

And while you might think that

the great white descended

from the megalodon,

it's closer to the blue shark.

See that snubbed nose and flat jaw?

But if we could see these two giants

face off now, who would win?

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Who would win in a fight?

A mongoose or cobra?

Liquid nitrogen or lava?

A saber-toothed tiger or a massive woolly mammoth?

We’ll break down each fight and see who takes the crown.

Click on the link below to find out.

Before we get to the main event,

let's run down the stats on these fighters.

The Leviathan whale grew

to almost 18.5 m (61 ft)

in length in its heyday.

While today's sperm whale

relies on suction to lure its prey,

this monster had teeth

the size of bowling pins

to rip its meals apart.

Its massive mouth

had the largest tetrapod bite recorded,

and it fed on other whales.

But these teeth

were not this killer's only weapon.

Some scientists theorize that

the sperm whale uses its unique organ,

the spermaceti, to control its buoyancy

during deep dives.

The waxy substance inside hardens

and lets the whale

sink into the water easier

by filling this body part with cold water.

But since the Leviathan

didn't hunt deep-sea creatures,

researchers think that

this organ could have been used

as a battering ram

to hammer prey into submission.

Scientists also wonder if this organ

could have increased

the whale's echolocation ability.

That means a Leviathan

could have stunned its target

with a sonic blast.

But how would the megalodon

handle this powerhouse?

Well, don't count out this predator yet.

Tests have dated

megalodon shark fossils back

two and a half million years.

And the largest bones

found were almost 18 m (59 ft) long,

making this

the largest fish to ever to roam the seas.

This shark had one

of the most powerful bite forces

of any predator on Earth.

And with 276 serrated teeth

that measured almost 18 cm (7 in) long,

this terror has earned

its fearsome reputation.

Like the Leviathans,

megalodons fed on large whales,

sharks and dolphins.

These gigantic creatures

were so fierce that some theories state

their babies would devour each other alive

while still developing in their mothers.

But you didn't come here

for Baby Shark.

Let's get to the main event.

Weighing in at almost 60 tons,

the megalodon

would outweigh the Leviathan.

The shark might have seen the whale first

while on patrol,

giving it ample opportunity to attack first.

While the whale comes in

at only 45 tons,

this killing machine

is much more intelligent than its opponent

and could try different tactics.

If the Leviathan had used

its agile swimming maneuvers

to get at just the right angle,

its sonic boom could stun the megalodon.

Then the whale could ram

the massive shark with its head.

But this warm-blooded mammal

couldn't stay underwater forever.

It had to come up for air.

That could give the megalodon

the opportunity to chase its deadly prey.

Speeding along at 17 m (55 ft) per second,

this ancient shark

could have cut through the water fast

and landed a bite on the Leviathan's fin,

making the whale all but helpless.

If the meg caught ahold of the fin,

it could tear through the whale

like a steel trap.

Remember, this predator

relied only on instinct and sheer power.

And unlike the Leviathan,

it did not back down.

But if the whale managed to bite

the shark's soft underbelly,

it could have a chance

of tearing apart its spine.

With a bite superior to the megalodon's,

a few strategic whale chomps

would end this fight once and for all.

While most people online give this fight

to the megalodon shark,

the Leviathan whale has the speed

and wits to come out on top.

What about you?

Who do you think would win this battle?

Let us know in the comments.

Now, this fight was the warm-up.

Next up, we have

the Gigantosaurus versus the Troodon.

Get to your corners because

that's a story for another WHAT IF.