HMS X1

The HMS X1 is a DLC submarine in Steel Diver: Sub Wars. It was added to the Shop on Valentine's Day 2014 (February 14, 2014), one day after the game launched. It is one of two British submarines in the game.

The HMS X1 was an experimental submarine commissioned Dec 1925 and eventually decommissioned in 1936. Only one was built, and it was the largest submarine of its time.