The majority of WWI submarines no longer exist, as many were sunk or sold for scrap. This isn't an unusual practice for the world's navies, but some boats remain and can be visited in museums.

The Deadly U-Boats Of WWI. The Imperial German Navy's U-boats were some of the deadliest vessels of the war, and they were responsible for sinking over 5,000 Allied ships.

Both submarines were used by the Imperial German Navy, which controlled the waters off the Belgian coast during WWI. One of the submarines is a type "U-5" U-boat measuring around 187 feet in ...

The underwater vessels were first used widely in the First World War ...

While the Hunley and the Alligator are the best known of the Civil War submarines, the most numerous were technically semi-submersibles. It was a Charleston physician, St. Julien Ravenel, who came ...

On Dec. 17, 1917, the U.S. submarine USS F-1 was lost at sea during a training accident off the coast of California, killing 19 crew members on board.

A World War I submarine wreck off the coast of Southern California has been captured for the first time in new video and images made possible using advanced deep-sea imaging technology.. The sunken ...

A World War I submarine wreck off the coast of Southern California has been captured for the first time in new video and images made possible using advanced deep-sea imaging technology.. The sunken ...

Submarines have been used in warfare for centuries. Undersea warfare has come a long way since the first experimental contraptions took to the seas. The modern nuclear-powered submarine represents ...