The little cup A History of the Titanic in 30 Pieces

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It's tiny. It's less than an inch high.

But it started off as a conventional cup.

I filmed the wreck of the Titanic,

and just to prove how dangerous it was,

we put ordinary polystyrene cups into net bags

outside the front of the submarine. We were at just over 12,800 feet.

That's about two and a half miles down.

The water pressure at the bottom of the Atlantic

would crush that submarine in seconds if it found a weak point.

The cups just get crushed

and crushed and crushed, but the water crushes them

equally from all sides, and it ends up,

when we come back up a few hours later,

with lots and lots of miniature cups.

When I eventually got home,

all I had to show for it was a handful of these plastic cups.

I was fascinated by how fascinated people were by them.

They just couldn't get their minds

round how a cup could be reduced to this size just by the sea.