OBERON (N21) 
- TYPE: Submarine
- DISPLACEMENT SURFACED: 1,490 t (1,513 tnes)
- DISPLACEMENT SUBMERGED: 1,892 t (1,922 tnes)
- MACHINERY: Twin Screws, Diesel/Electric
Motors; 3,000/1,350 hp - LENGTH: 273.67 ft (83.4 m)
- BEAM: 27.25 ft (8.3 m)
- DRAUGHT: 15 ft (4.6 m)
- PERFORMANCE SURFACED: 15.5 knots
- PERFORMANCE SUBMERGED: 9 knots
- ARMAMENT: 8 21in TT; 1 4in gun
- SURFACE RANGE: 5,633 nm (9,500 km)
- CREW: 54
- LAUNCHED: September 24, 1926