Here's the Sierra Magdalena.

I get up there on that playground.

In the spinal ward, that's normal.

A big treat, with sirloin meat, fish loaf, green onions and prawns.

Crossing miles and miles of sastrugi frozen ice snowdrifts that could be hip deep.

But 10 miles down the ridge...

I had cold fingers up my back till I looked in the bathroom.

They're going to be the tough ones.

We're going to look at the mid ocean ridge, a 40,000 mile long mountain range.

She had a spina bifida defect, a spinal cord abnormality.

KA Sort of like the Spinal Tap scene where you get the tiny little Stonehenge, I guess?

We have the Southern right whale that we see here and the North Atlantic right whale that we see here with a mom and calf off the coast of Florida.

They picked as much broken bone as they could that had lodged in my spinal cord.

This was a device that a nurse uses when they're doing a spinal procedure in hospital.

Well, there wasn't much else to do in the spinal ward, so we did.

A fractured spine?

A vertebrae.

There were chills up my spine

And then I remembered my friends that were still in the spinal ward, particularly Maria.

In the police van, he was repeatedly kicked on the back, causing damage to his spinal cord.

This sent shivers up my spine.

This is a bowhead whale.

This is a volcanic ridge.

Now, at this phase, the program actually has some understanding of the topology of this creature. It kind of knows where the backbone is, where the spine, the limbs are.

The mid ocean ridge is a huge mountain range, 40,000 miles long, snaking around the entire globe.

We make maps of these mountain ranges with sound, with sonar, and this is one of those mountain ranges.

Umar also has polio.

Chills run up and down my spine.

And in the last six months, we've had less places reinfected by polio than at any other time in history.

It turns out that this lane here goes right through a major feeding area of right whales in the summer time, and it makes an area of a significant risk of collision.

My spine curves spiral.

Wait, poor spinal capacity.

Bugle. Chinese. Up on the ridge.

And here is actually the spinal column and the whole torso encased in a sandstone block, because she was buried by a river.

This is the polio virus.

And so here's the front and the spine, and it's flat.

The climbers got on the southeast ridge.

It makes the backs of me legs go funny. Height always did.

Looks a little higher up on that ridge.

It'll break her backbone right away.

More myself was the backbone, of course.

This is a polio vaccine.

With polio it's almost completely different.

I'd broken my neck and my back in six places.

This is the view looking at the southeast ridge.