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.

At dawn on Feb. 28, 1942, according to the Navy, it was torpedoed and sunk by a German U-boat off the coast of Delaware. The crew of the USS Jacob Jones spotted the German torpedo coming at them ...

A diary handed down through three generations has helped find the wreck of a German U-boat sunk by a secret Royal Navy Q-ship in 1917. Henrietta Sandford, from Helston, shared diaries and letters ...

This married couple loves to explore shipwrecks, and on this day they're heading to a location that attracts divers from ...

Two days later, the German U-boat U-552 left the French port of St ... US merchant ships had already been sunk in the Atlantic, and in mid-October, another US destroyer was hit by a torpedo ...

If a boat sunk a lot of ships, it was celebrated accordingly back in the harbor and in the press. NOVA: And that was incentive enough? U-869's crew assembles on deck. Guschewski: That was enough ...

Did you know? In WWII the British troop ship, RMS Laconia, was sunk by a German U-boat. The U-boat captain Werner Hartenstein immediately ordered the rescue of as many survivors as possible ...