German U-boats nearly strangled Allied supply lines during the war. This video explains how codebreakers exposed their movements and plans. Decrypted messages allowed convoys to avoid danger or set traps.

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. The ship carried 47 men and 11,200 tons of kerosene (then ...

Submarines were key for Allied and Axis forces throughout World War II. At the war's onset, Germany's fleet of U-boat submarines created a distinct advantage for the Nazi's Kriegsmarine.According to the U.S. National Park Service, German submarines sank ...

The Brazilian Navy has confirmed that a wreck found in 2011 is that of a Brazilian auxiliary ship sunk in 1944 by a torpedo from the German U-boat U-861. About 100 lives were lost when the Vital de Oliveira went under in July 1944, out of about 270 people ...

Officials say intercepted communications are the core of the intelligence collected on the boats. By Julian E. Barnes Reporting from Washington The Trump administration claims that the boats it has destroyed in the Caribbean and the Pacific were ...

In an era of hypersonic missiles, stealth fighters, and nuclear subs, it’s hard to picture sailors going toe-to-toe with the enemy on a ship’s deck. Yet during World War II, the crew of a brand-new destroyer escort, USS Buckley, did just that by ...