CB-class midget submarine

The former CB-20 in the Technical Museum, Zagreb
Class overview
Builders	Caproni
Operators	Regia Marina National Republican Navy  Royal Romanian Navy  Kriegsmarine  Soviet Navy  Yugoslav Navy
Preceded by	CA class
Built	1941–1943
In commission	1941–1950s
Planned	72
Completed	21
Preserved	2
General characteristics
Type	Midget submarine
Displacement	35.4 tons surfaced 44.3 tons submerged
Length	15.00 m (49 ft 3 in)
Beam	3.00 m (9 ft 10 in)
Draught	2.05 m (6 ft 9 in)
Propulsion	1 diesel engine, 1 electric motor, 1 shaft
Speed	7.5 knots (13.9 km/h; 8.6 mph) surfaced 7 knots (13 km/h; 8.1 mph) submerged
Complement	4
Armament	2 x 450 mm torpedoes (could be replaced by 2 mines)

The CB class was a group of midget submarines built for the Italian Navy during World War II. However, they were also used by several other navies, seeing action in the Mediterranean and in the Black Sea.