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 the fabrication of the pressure hull.

[3] 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.

[3] Oracle was laid down by Cammell Laird on 26 April 1960, and launched on 26 September 1961.

Oracle attended the 1977 Silver Jubilee Fleet Review off Spithead when she was part of the Submarine Flotilla.

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