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CB20 (P901)  from Wikipedia
 
CB - clasas midget submarine

The CB class was a group of midget submarines built for the Italian Navy during World War II.

Design

The boats were designed as coast defence units with diesel electric propulsion. There was a mini conning tower to aid navigation. The armament consisted of two torpedoes mounted externally which could be reloaded without removing the craft from the water.

Boats

Seventy two boats were ordered from Caproni of Milan, but only 22 were laid down. 12 boats were completed before the Armistice and nine after. Six boats were transferred to the Black Sea by rail and fought the Soviets sinking two submarines. After the Italian Armistice, the five survivors were transferred to the Royal Romanian Navy.
P 901
Only one left
 
Name:  CB20 now P901
Builder: Capronni
Launched: 1943
Commissioned:  1943
Speed: 7.5  knots surfaced
7 knots submerged
Displacement: 35.4 tons surfaced
44.3 tons  sumberged
Length: 14.99 m
Beam: 3 m
Complement:  4
Boat Completed Service / Fate
CB 1 27 January 1941 Transferred to the Black Sea, To Romania 1943, Scuttled August 1944, raised by USSR and commissioned as TM-4, scrapped 1945
CB 1  27 January 1941 Transferred to the Black Sea, To Romania 1943, Scuttled August 1944, raised by USSR and commissioned as TM-4, scrapped 1945
CB 2  27 January 1941 Transferred to the Black Sea, To Romania 1943, Scuttled August 1944, raised by USSR and commissioned as TM-5, scrapped 1945
CB 3  10 May 1941 Transferred to the Black Sea, To Romania 1943, Scuttled August 1944, raised by USSR and commissioned as TM-6, scrapped 1945
CB 4  10 May 1941 Transferred to the Black Sea, To Romania 1943, Scuttled August 1944, raised by USSR and commissioned as TM-7, scrapped 1945
CB 5  10 May 1941 Transferred to the Black Sea, sunk by Soviet aircraft near Yalta, 13 June 1942
CB 6  10 May 1941 Transferred to the Black Sea, To Romania 1943, Scuttled August 1944
CB 7  1 August 1943 Captured by Germany at Pola September 1943- transferred to the Italian Social Republic, cannibalised for spare parts
CB 8  1 August 1943 Surrendered to Britain 1943, Scrapped 1948
CB 9  1 August 1943 Surrendered to Britain 1943, Scrapped 1948
CB 10  1 August 1943 Surrendered to Britain 1943, Scrapped 1948
CB 11  24 August 1943 Surrendered to Britain 1943, Scrapped 1948
CB 12  24 August 1943 Surrendered to Britain 1943, Scrapped 1948
CB 13   Late 1943 ? Captured by Germany 1943, Transferred to Italian Social Republic, Sunk by Allied aircraft 23 March 1945
CB 14  Late 1943 ? Captured by Germany 1943, Transferred to Italian Social Republic, Sunk during air raid
CB 15  Late 1943 ? Captured by Germany 1943, Transferred to Italian Social Republic, Sunk during air raid
CB 16  Late 1943 ? Captured by Germany 1943, Transferred to Italian Social Republic, Sunk during air raid
CB 17  Late 1943 ?  Captured by Germany 1943, Transferred to Italian Social Republic, Sunk by Allied aircraft 3 April 1945
CB 18  Late 1943 ? Captured by Germany 1943, Transferred to Italian Social Republic, Sunk 31 March 1945
CB 19  Late 1943 ? Captured by Germany 1943, Transferred to Italian Social Republic, Broken up 1947
CB 20  Late 1943 ? Captured by Germany 1943, Transferred to Italian Social Republic, Captured by Yugoslav Partisans in Pola at the end of the War, In active service in Yugoslav Navy till 1959. as P-901 On display at the Technical museum Zagreb
CB 21  Late 1943 ?  Captured by Germany 1943, Transferred to Italian Social Republic, rammed and sunk by a Marinefährprahm in the Adriatic 29 April 1945
CB 22  Captured by Germany in 1943, taken to Pola and abandoned at the end of the war. Wreck salvaged and preserved in Trieste
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