HMS M1
Submarine
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HMS M1 was a submarine of the British Royal Navy, one of four vessels of her class ordered towards the end of the First World War. She sank with the loss of her entire crew in 1925.
The vessels were originally intended as "submarine monitors", but... Wikipedia
Launched: July 9, 1917
Builder: Vickers
Fate: Sunk in collision, 12 November 1925
Range: 2,000 nmi (2,300 mi; 3,700 km) at 15 kn (17 mph; 28 km/h); 4,500 nmi (5,200 mi; 8,300 km) at 10 kn (12 mph; 19 km/h)