HMS X1
Submarine
HM Submarine X1 was a British submarine of the interwar period. Conceived and designed as a submersible commerce raider for the Royal Navy; at the time of her launching she was the largest submarine in the world. Wikipedia
Launched: June 16, 1923
Construction started: November 2, 1921
Draft: 15′
Propulsion: 4 × diesel engines; 2 × electric motors
Test depth: 350 ft (110 m)