A quick warning before we begin this

before we begin this episode contains themes of a sexual nature.

In the last episode I went sexual nature.

In the last episode I went off to the National Archives with my producer Sarah, found a newspaper

interview with Crab's ex-wife in which she insisted that Larno Krab was alive and well and living in the Soviet Union.

There are any number of theories about what might have happened to L Krab, but the one certainty is this.

He disappeared, vanished, into thin air.

And this idea of people disappearing, it's always fascinated me.

Because wherever we go, we leave a trail of clues,

bank cards, mobile phones, GPS, and the street cameras and CCTV.

But in Crab's Day, there were none of these things.

So could it have been easier?

Perhaps you know the story of the prisoners who escaped from an American jail in the early 60s, one of the boldest prison breakouts in history.

And that prison was Alcatraz.

Forbidding Alcatraz prison, from which no man has ever been known to escape as its name for impregnability at state.

A daring break for freedom by three convicts triggers a manhunt through the caves with which the rock is riddled and throughout the entire San Francisco. The break out

out of the caves with which the rock is riddled and throughout the entire San Francisco area.

The breakout happened just a few years after Lionel Krab's disappearance in 1956. And those prisoners, they were not just

intending to escape, they were intending to disappear forever. But how? After tunneling through a four inch concrete wall, they climbed up a pipe

shaft to the cell block roof. And in a series of incredible climbs and drops they reached the water's edge.

For most people that water was the prison's most formidable obstacle.

But to the escapees, it was their lifeline.

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