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 ...

The USS F-1 was hit broadside by another sub during a training exercise and sank in seconds, killing 19 members of the crew.

On June 29 a satellite passing over Russia’s arctic north captured an intriguing image. It looks like a rocket plume racing across the sky, but it is in fact Russia's latest submarine.

The image shows the U.S. Navy's second submarine rescue vehicle attached to a nuclear submarine during a training exercise in 1992, not a Russian submarine carrying an underwater missile.

North Korea may be close to launching a submarine capable of firing missiles and is making efforts to conceal its preparations, new commercial satellite images obtained by CNN appear to show.

North Korea may be close to launching a submarine capable of firing missiles and is making efforts to conceal its preparations, new commercial satellite images obtained by CNN appear to show.