A military submarine that crashed over 100 years ago has finally been found on the bottom of the ocean.
The huge Navy vessel was discovered off the coast of California after being lost during a training accident in 1917.
It was spotted in sand next to a training aircraft that had crashed into the sea in an unrelated incident in 1950.
Researchers released incredible images of the sunken vehicles after finding them using advanced underwater technology and expert divers.
The US Navy submarine USS F-1 collided with its sister sub - USS F-3 - during surface exercises off the coast of San Diego on December 17, 1917.
