The HMS M1 was constructed during WW1 but was never used in combat due to fears the Germans would copy its revolutionary design.

In 1918, one of the largest, best-equipped German U-boats executed the only attack on US soil during World War I. A rain of shells fell on top of Nauset Beach in Massachusetts while hundreds of ...

Over a century after it vanished, Australia's first ever submarine to disappear along with its crew during the First World War has been found. The Australian Royal Navy announced that the 103-year ...

During the Civil War, both sides were working on early submarine designs, though it was the Confederacy that was the first to deploy one against the enemy.

A group of divers have explored the wreckage of a WW1-era Royal Navy submarine – 100 years after it sank. Dominic Robinson, 54, and a team of 10 dived 74m down to check out the century-old HMS M1 sub ...