HMS Sentinel was a S-class submarine of the third batch built for the Royal Navy during World War II.

[2] For surface running, the boats were powered by two 950-brake-horsepower (708 kW) diesel engines, each driving one propeller shaft.

[1] On the surface, the third batch boats had a range of 7,500 nautical miles (13,900 km; 8,600 mi) at 10 knots (19 km/h; 12 mph) and 120 nmi (220 km; 140 mi) at 3 knots (5.6 km/h; 3.5 mph) submerged.

[1] HMS Sentinel was built by Scotts of Greenock and launched on 27 July 1945.

In 1953 she took part in the Fleet Review to celebrate the Coronation of Queen Elizabeth II.