battleships - the guns and mounting weighting about 120 tons and the 40 rounds of ammunition 29 tons.
At the end of the war, the question of future employment of the M Class arose as 'there were no targets and the enemy had not initiated anything bold in submarine policy'. Consequently, during the 1920s, the three M Class submarines led contrasting lives.
On October 25th, 1925, M1 was rammed by the SS Vidal off Start Point and was lost without survivors.
M2 and M3 had their large 12-inch guns removed in the late 1920s to conform with the Washington Disarmament Treaty, which stated that no submarine should have larger than 8-inch
