Submarine H5 had sailed for a patrol in the Irish Sea. In the morning of Saturday, 2nd March 1918 the Submarine was sighted after it had crossed the bows of a steamer, the SS Rutherglen. The Captain of the Rutherglen believed that he had come across a U-Boat and he rammed the submarine resulting in the loss of all the crew. SS Rutherglen was herself sunk on 24th April 1918 after being torpedoed by a U-Boat whilst on passage between Gibraltar and Genoa.
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Supergun Submarine located 74 years after tragic loss
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.