H.M.S. M1
1918
(Navis 177)
- Class: M class - 4 submarines of 1915
- Displacement: 1,594 tons surfaced; 1,946 tons submerged
- Dimensions: 296 x 25 ft.
- Machinery: twin-shaft, two 12-cylinder Vickers diesels, 4 electric motors, 2,400hp/1,600hp = 15/9 knots
- Armament: 1-12 in., 1-3 in. A.A.; 4-18 in. T.T. (bow)
- Complement: 62
- Builder: Vickers, Barrow
- Laid Down: 1916
- Launched: 9 Jul 1917
- Completed: 1917
- Notes: Sank with all 69 hands after collision with Swedish collier SS Vidar on 12 Nov 1925 while on an exercise in the English Channel.
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