HMS H1 was a H-class submarine built by Canadian Vickers Co., Montreal for the British Royal Navy. She was laid down on 11 January 1915 and was commissioned on 26 May 1915. H1 crossed the Atlantic from St. John's, Newfoundland to Gibraltar escorted by the armed merchant cruiser . She was accompanied by , and . H1 mistakenly sank the off Cattaro on 15 April 1918. H1 was sold on 7 March 1921 in Malta. Design Like all pre-H11 British H-class submarines, H1 had a displacement of at the surface and while submerged. It had a total length of , a beam of , and a draught 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 . H1 was fitted with a Hotchkiss quick-firing gun and four torpedo tubes. Its torpedo tubes were fitted to the bow 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. References British H-class submarines Ships built in Quebec 1915 ships World War I submarines of the United Kingdom Royal Navy ship names