Ships: CB 1, CB 2, CB 3, CB 4, CB 6

On 30 November 1943 was created the 2nd Submarine Squadron, composed of five CB Italian midget subs, but which were in poor condition. Only two of these became operational by 1 July 1944. They carried out only observation missions at 30 miles from the coast. One of them was sunk during a Soviet air-attack on 20 August 1944.

Specifications

Crew	3
Displacement on surface	36t
Displacement in imersion	45t
Length	15m
Width	3m
Draft	2.1m
Max speed on surface	7 knots
Max speed in imersion	7.5 knots
Range	450 miles
Torpedo tubes	2 x 450mm
Engine type	Diesel - Issota Fraschini 90 hp Electric - Brown-Bowery 100 hp