U-475 Black Widow (Foxtrot B-39)

This giant (301 ft or 92 m) Soviet Navy submarine was built in 1967 in Leningrad and decommissioned in 1994. It was used to train Libyan, Cuban and Indian submariners.

It passed into private hands and used as a museum ship near the Thames Barrier in the UK and later in Folkestone. It was closed in 2004, and since then it's been waiting for restoration.

(via Foantje and Medway Lines)