The Oberon class was a direct follow on of the Porpoise-class, with the same dimensions and external design, but updates to equipment and internal fittings, and a higher grade of steel used for fabrication of the pressure hull.

[2] Propulsion machinery consisted of 2 Admiralty Standard Range 16 VMS diesel generators, and two 3,000 shaft horsepower (2,200 kW) electric motors, each driving a 7-foot diameter (2.1 m) 3-bladed propeller at up to 400 rpm.

In June 1965 she carried out submarine escape trials off Malta, with a record 500 feet (150 m) free ascent made.

Other duties including training Canadian and Australian crews for Oberon-class submarines that were being built for those countries.

[5] She was paid off in 1987; subsequently she served as the 'alongside trainer' at the RN Submarine School, HMS Dolphin, where she provided new recruits with a hands-on training environment.