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 HMS Calgarian (1913). She was accompanied by HMS H2, HMS H3 and HMS H4. H1 mistakenly sank the ITALIAN SUBMARINE H5 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 364 LT at the surface and 434 LT while submerged. It had a total length of 150 ft, a beam of 15 ft, and a draught of 12 ft. It contained a diesel engines providing a total power of 480 hp and two electric motors each providing 320 hp power. The use of its electric motors made the submarine travel at 11 kn. It would normally carry 16.4 LT of fuel and had a maximum capacity of 18 LT.

The submarine had a maximum surface speed of 13 kn and a submerged speed of 11 kn. British H-class submarines had ranges of 1600 nmi. H1 was fitted with a 6 pdr Hotchkiss quick-firing gun and four 18 in torpedo tubes. Its torpedo tubes were fitted to the bow and the submarine was loaded with eight 18 in torpedoes. It is a Holland 602 type submarine but was designed to meet Royal Navy specifications. Its complement was twenty-two crew members.