Built By: Vickers (Barrow)
Build Group: M
Fate: Rammed and was sunk on 12th November 1925 by SS Vidar off Start Point. Wreckage was not found until 1990 by Royal Navy and more recently by divers in 1999.

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Started life a K18. Served with the 6th Flotilla until October 1918.

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Supergun Submarine located 74 years after tragic lossRead
The British submarine, M1 which uniquely carried the firepower of a battleship was discovered 35 miles south-east of Plymouth at a depth of 81 metres by diver and submarine expert, Innes McCartney and boat skipper Grahame Knott.


01-07-1916 : Laid Down
09-07-1917 : Launched
17-04-1918 : Completed
12-11-1925 : M1 was rammed by the SS Vidal off Start Point and was lost without survivors.


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