HNLMS O 20

O 20
History
Netherlands
Name	O 20
Builder	Wilton-Fijenoord, Rotterdam
Laid down	15 June 1936
Launched	31 January 1939
Commissioned	28 August 1939
Fate	Sunk on 19 December 1941
General characteristics [1]
Class and type	O 19-class submarine
Displacement	1109 tons surfaced 1491 tons submerged
Length	80.7 m (264 ft 9 in)
Beam	7.41 m (24 ft 4 in)
Draught	3.87 m (12 ft 8 in)
Propulsion	2 × 2,650 bhp (1,976 kW) diesel engines 2 × 500 bhp (373 kW) electric motors
Speed	19.5 kn (36.1 km/h; 22.4 mph) surfaced 9 kn (17 km/h; 10 mph) submerged
Range	10,000 nmi (19,000 km; 12,000 mi) at 12 kn (22 km/h; 14 mph) on the surface 27 nmi (50 km; 31 mi) at 8.5 kn (15.7 km/h; 9.8 mph) submerged
Complement	40
Armament	4 × 21 in (530 mm) bow torpedo tubes 4 × 21 in (530 mm) stern torpedo tubes 2 × external amidship mine tubes (10 mines each) 1 x 88 mm gun 1 x 40 mm gun

O 20, laid down as K XX, was a O 19-class submarine of the Royal Netherlands Navy that saw service during World War II. O 20 along with her sister ship O 19 were the first boats in the world to be equipped with a submarine snorkel that allowed the submarine to run its diesel engines while submerged.^[1][2]