Sugar Boat, Clyde Estuary
The “sugar boat” is what I have heard it called. Apparently sunk in the ’60s. It is clearly visible from both sides of the river Clyde, Greenock and Helensburgh, and apparently from space, too.

Since Derek Murray posted about Google Map’s new satellite imagery of Paisley, I found that the inverclyde area is covered as well. Cheers Derek.
May 22nd, 2007 at 15:26 pm
Sank in 1974, actually.