Walrus-class submarine

Class overview
Name	Walrus class
Builders	Rotterdamsche Droogdok Maatschappij
Operators	Royal Netherlands Navy
Preceded by	Dolfijn class Zwaardvis class
Succeeded by	Orka class
Cost	ƒ500 million per unit (1992)[1]
Built	1979–1992
In commission	1990–present
Planned	6[2]
Completed	4
Cancelled	2
Active	3
Retired	1
General characteristics [3][4][5]
Type	Diesel-electric attack submarine
Displacement	2,450 t surfaced, 2,800 t submerged, 1,900 t standard
Length	67.725 m (222 ft 2.3 in)
Beam	8.40 m (27 ft 7 in)
Draft	6.60 m (21 ft 8 in)
Propulsion	1 shaft (5 blades) 3 x SEMT Pielstick PA4 200 VG diesel engines 6,300 hp (4,700 kW) 1 x HOLEC electric motor 420-cell VARTA batteries
Speed	13 knots (24 km/h; 15 mph) surfaced, 21 knots (39 km/h; 24 mph) submerged
Range	18,500 km (10,000 nmi) at 9 kn (17 km/h; 10 mph)
Test depth	>300 m (980 ft)
Complement	49 to 52
Sensors and processing systems	Radars: Signaal/Decca 1229 Signaal ZW-07 Argo Phoenix I Sonar Systems: Thomson Sintra TSM 2272 Eledone Octopus GEC Avionics Type 2026 towed array Thomson Sintra DUUX 5 passive ranging and intercept Fire-control system: HSA GIPSY (SEWACO VIII)
Armament	4 × 21-inch (533 mm) torpedo tubes (20 × Honeywell Mk 48 torpedoes or Honeywell NT 37 C/D/E torpedoes UGM-84 Harpoon SSM 40 mines)

The Walrus-class submarine is the only submarine class currently in operation in the Royal Netherlands Navy. The boats have been in service since 1990 and are all named after sea mammals.