[3] It contained a diesel engines providing a total power of 480 horsepower (360 kW) and two electric motors each providing 320 horsepower (240 kW) power.

[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][3] H44 was fitted with an anti-aircraft gun and four 21 inches (530 mm) torpedo tubes.

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