or U-boats, sunk, scuttled, captured, or otherwise lost to German forces during World War II. Here, naval historian Timothy Mulligan describes 25 of the most historically significant U-boats.

The one time he did see a U-boat, the submarine was trying to be found. "It was quite spectacular, at the end of the war there was a U-boat that wanted to surrender," Bert said. "This one was ...

The weapon would be the submarine, U-boats. On a desolate mud bank in the salt marshes of Kent lies the metal carcass of a First World War German U-boat. British ships were blockading German ports ...