 As designed for British service, the "Oberon"-class submarines were in length between perpendiculars and in length overall, with a beam of , and a draught of .Displacement was 1,610 tons standard, 2,030 tons full load when surfaced, and 2,410 tons full load when submerged.Propulsion machinery consisted of 2 Admiralty Standard Range 16 VMS diesel generators, and two electric motors, each driving a 3-bladed propeller at up to 400 rpm.