Soviet submarine S-99

Profile of Whale-class submarine
History
Soviet Union
Name	S-99
Builder	Sudomekh Shipyard, Leningrad
Laid down	5 February 1951
Launched	5 February 1952
Completed	December 1955
Commissioned	26 March 1956
Decommissioned	28 February 1964
Reclassified	As an experimental submarine, 31 August 1961
Fate	Scrapped after 28 February 1964
General characteristics
Type	Experimental submarine
Displacement	950 t (930 long tons) (surfaced) 1,500 t (1,476 long tons) (submerged)
Length	62.2 m (204 ft 1 in)
Beam	6.08 m (19 ft 11 in)
Draft	5.08 m (16 ft 8 in)
Propulsion	1 × propeller shaft 1 × Walter HTP turbine (7,250 PS (5,330 kW)) 1 × Diesel engine (600 PS (440 kW)) 1 × Electric motor (540 PS (400 kW)) 1 × Electric motor (140 PS (100 kW))
Speed	11 knots (20 km/h; 13 mph) (surfaced) 20 knots (37 km/h; 23 mph) (submerged)
Range	8,500 nmi (15,700 km; 9,800 mi) at 8.5 knots (15.7 km/h; 9.8 mph) (surfaced) 198 nmi (367 km; 228 mi) at 14.2 knots (26.3 km/h; 16.3 mph) (submerged)
Endurance	45 days
Test depth	170 m (560 ft)
Complement	51
Sensors and processing systems	Tamir-5LS sonar Mars-24 KEG hydrophones Nakat radar
Armament	6 × 533 mm (21 in) bow torpedo tubes

The S-99 (Russian: С-99) experimental submarine was the only ship of the Project 617 class (codenamed Whale) that the Soviet Union built during the early Cold War. She was the only Soviet submarine which used a German Walter turbine fueled by high-test peroxide (HTP). Entering service in 1956, the boat was assigned to a training unit of the Baltic Fleet. S-99 was badly damaged by a HTP explosion in 1959 and was not repaired. The submarine was decommissioned in 1964 and subsequently scrapped.