HMS H1

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

She had a displacement of at the surface and while submerged. Her total length was, with a beam of and a draught of.
Her two diesel engines provided a total power of and her two electric motors provided power which gave the submarine a maximum surface speed of and a submerged speed of. She would normally carry of fuel and had a maximum capacity of and a range of. The boat was armed with a Hotchkiss quick-firing gun and four bow torpedo tubes with six torpedoes carried. The complement was twenty-two crew members.