once these shipwrecks were on the sea bottom, now you can walk among them

The Aral Sea, between Kazakhstan in the north and Karakalpakstan, an autonomous region of Uzbekistan, in the south, was once the world's fourth-largest lake with an area of 68,000 square kilometres.   It has been steadily shrinking since the 1960s, after the rivers that fed it were diverted by Soviet Union's irrigation projects. And now it's almost gone, leaving a desert full of old shipwrecks. And it had already been starved of nearly 30 years of water by 1989.

Similar occurrences are now beginning to happen elsewhere in the world.

Thanks to Bert for sending this in.