Germany's U-505 submarine was the 1st warship captured by the US Navy in over a century and top secret during World War II. See photos of the inside.

The U-Boat’s crew, who were on their first patrol, raised the white flag after the sub was damaged by depth charges dropped from a British bomber on Aug. 27, 1941.

Scientists used submersibles to explore a German U-boat sunk 7 miles off the Rhode Island coast ... which is closer to shore and in shallower water than U-853, which sits 130 feet below the surface.

The German 'U-boat' submarine U-576 has been seen for the first time since sinking about 74 years ago. ... The submarine rests about 721ft. below the water's surface.

The U-550 is one of several World War II-era German U-boats that have been discovered off the U.S. coast, but it's the only one that went down in that area, Mazraani said.

But after firing the torpedoes, the U-boat inexplicably bobbed to the surface in the middle of the convoy. Patrolling airplanes and gunners on one of the convoy ships pounced.

These U-boats would prowl for American ships at the time. The U-boat discovered, U-166, sank three small ships and the SS Robert E. Lee south of Louisiana on June 30, 1942, killing 25 ...

A U.S. Navy study concluded each standard Type VII U-Boat cost Nazi Germany $2.25 million dollars—while a four-engine B-24 cost about $297,000 and a twin-engine Catalina seaplane $90,000.

The collapsing Nazi government ordered all U-boats in German ports to make their way to their bases in Norway on May 2, 1945. Two days later, the recently commissioned U-3523 joined the mission as ...

The U.S. Navy sunk many German U-boat submarines in World War II. But then they captured one, right before the D-Day invasion.

Revisiting the German U-boat menace. Wayne Anderson. In World War II, ... Of the 632 U-boats sunk at sea, Allied surface ships and shore-based aircraft accounted for the great majority.

Early on June 29, 1942, the 8,032-ton British steam tanker HMS Empire Mica cruised east through calm waters toward Key West, Florida, where it planned to join a convoy bound for the United Kingdom.