HMS H29 was a British H class submarine built by Vickers Limited, Barrow-in-Furness.

HMS H29 was sunk during trials at Devonport Dockyard following a recent refit on 9 August 1926.

[3] The use of its electric motors made the submarine travel at 11 knots (20 km/h; 13 mph).

Post-H20 British H-class submarines had ranges of 2,985 nautical miles (5,528 km; 3,435 mi) at speeds of 7.5 knots (13.9 km/h; 8.6 mph) when surfaced.

[1] It is a Holland 602 type submarine but was designed to meet Royal Navy specifications.