HMS H10  HMS "H10" was a British "H"-class submarine built by the Canadian Vickers Co., Montreal. She was laid down on an unknown date and was commissioned in June 1915. HMS "H10" was lost in the North Sea on 19 January 1918. It had a complement of twenty-two crew members, a length of , and a surfaced range of at . Like all pre-"H11" British H-class submarines, "H10" had a displacement of at the surface and while submerged. It had a total length of , a beam length of , and a draught length of . It contained a diesel engines providing a total power of and two electric motors each providing power. The use of its electric motors made the submarine travel at . It would normally carry of fuel and had a maximum capacity of . The submarine had a maximum surface speed of and a submerged speed of . British H-class submarines had ranges of at speeds of . "H10" was fitted with a Hotchkiss quick-firing gun (6-pounder) and four torpedo tubes. Its torpedo tubes were fitted to the bows and the submarine was loaded with eight torpedoes. It is a Holland 602 type submarine but was designed to meet Royal Navy specifications. Its complement was twenty-two crew members.