that you can't stop.

It can completely destroy cities

and kill tens of thousands of people.

It looks like another big wave at first,

but as it gets closer, you can see

it's not just big.

It's HUGE!

It's a tsunami.

You should probably run away from it,

but instead,

we're going to surf it.

Seriously? This can't be good.

Well, we better get started.

The biggest wave that someone has surfed on

was 24.4 meters tall (80 feet).

Tsunamis can be around this height

but for our purposes let's go a little bigger

and say ours is 30 meters tall (100 feet).

But if you do want to surf on a tsunami

- and we don't recommend you do it ,

you'll most likely have to travel to Japan

or the Philippines.

This is because they're located

in the Ring of Fire,

an area in the Pacific Ocean where tsunamis are most likely to occur.

But wait,

how do tsunamis occur anyways?

Tsunamis are different from the usual waves

caused by wind and tides.

Tsunamis form due to volcanic activity,

but most often after an earthquake occurs in the ocean.

If an earthquake happens in the sea that's

6.5 or higher on the Richter scale,

you can expect a tsunami to come heading for land.

This massive wave will start

deep in the ocean and

build its way up to the coastline,

quickly gaining speed and power.

Experts say that a tsunami can move up to

800 km/h (497 mph) as it reaches the shore,

so be prepared for a wave as fast a passenger jet.

And although tsunamis start as small bumps deep in the ocean,

as they reach shallower water

they become much more massive.

So how would you surf on this thing?

Let's hope you have a friend that's just as daring as you.

Because the wave is moving so fast,

you'd need your friend to drive up the wave on a jet ski

while you hitch a ride on the back.

If you manage to get to the top,

you'll quickly realize that

this wave is completely different

from any other wave you've surfed before.

That's because tsunami waves don't break

as opposed to regular waves created by wind.

A breaking wave curves and cascades onto itself,

making it the perfect wall for your surfboard.

But generally speaking,

a tsunami doesn't have this quality.

Apart from the massive size,

and the incredible speed of the tsunami,

surfing on it would be nearly impossible because

there wouldn't be much for your board to grip onto.

But you're up here now, so what do you do?

Well, your best bet

is to really only hold on for your dear life and hope for the best.

Let's be real here;

there's no way you're going to be able to surf on this monster.

You'll quickly be hurled towards whatever coast the tsunami decides to bring you to.

And you probably won't just land on the beach either.

You could be several hundred meters or

even kilometers inland.

It could hurl you against the side of a bus,

or into a building.

And after the tsunami brings you there

that won't be all that happens.

After it tosses you inland,

the waves will pull you right back out into the ocean.

Now it's not only you in the tsunami.

Other people,

cars, and even entire parts of buildings will all be forced into the ocean,

causing even more destruction as they slosh through the tsunami's path.

You may think it's over now,

but that isn't the case.

A tsunami isn't just one massive wave;

it's multiple waves.

A tsunami can last for up to an hour.

With waves up to 30 meters (100 feet)

continually hitting the coast while destroying cities and killing people.

So once you lose your surfboard,

you'd be in the water with everything else,

being pushed back and forth from the coast and back out to the sea.

You'd keep doing this until you inevitably drown

or die from getting hit by debris.

So although surfing a tsunami would make for a pretty gnarly story,

maybe we should stick to regular breakers for now.

One person who might be a contender to tame a tsunami

would be legendary Big Wave Surfer Laird Hamilton.

I gotta admit, I didn't know much about big wave surfers until I listened to his book "Liferider" on Audible.

But he's one of the icons of the sport, and

you get a real insight into what goes on in the mind of someone who's not afraid to tackle enormous challenges.

Audible is where so many inspiring voices and compelling stories

open listeners up to new experiences, and ways of thinking.

Listening makes us smarter, more connected people.

It makes us better partners, parents, and leaders.

And there's no better place to start listening than Audible.

We're big fans of Audible here at Underknown, and

we use many of their audio books to inspire the videos that we make for you.

So thanks Audible for inspiring us.

You can start listening today with a 30-day Audible trial.

Your first audiobook, plus two Audible Originals are free.

Visit audible.dot com slash What If - that's audible.dot com slash What If to sign up, or text (WhatIf) to 500-500.

Even if you were to try to surf a tsunami,

and somehow survived,

you could be pretty badly hurt and in a lot of pain.

But what if you couldn't feel pain?

Then you could probably do it!

But we'll leave that story, for another, WHAT IF.