Type B submarine


The Cruiser submarine Type-B was a class of submarine in the Imperial Japanese Navy which served during World War II. The Type-B submarines were similar to the Type-A apart from not having the headquarters installation.

Class variants

The Type-B submarines were divided into four classes:
Project number S37. Twenty boats were built between 1937 and 1944 under the Maru 3 Programme and Maru 4 Programme.
Boat No.BoatBuilderLaid downLaunchedCompletedFate
37Kure Naval Arsenal25-01-193807-03-193930-09-1940Probably lost in an accident or sunk by enemy attack near Guadalcanal, after 03-11-1942
38Yokosuka Naval Arsenal25-08-193712-11-193831-01-1941Sunk by and maritime patrol aircraft at Nouméa on 19-08-1943
39Mitsubishi, Kōbe Shipyard15-03-193816-09-193928-04-1941Sunk by in the Gilbert Islands on 25-11-1943
40Kawasaki, Kōbe Shipyard07-01-193924-02-194015-07-1941Probably lost in an accident or sunk by enemy attack near Tarawa, after 27-11-1943
41Yokosuka Naval Arsenal08-12-193824-11-193927-09-1941Probably lost in an accident or sunk by enemy attack near the Hawaiian Islands, after 14-02-1942
42Mitsubishi, Kōbe Shipyard03-02-193908-06-194015-10-1941Probably lost in an accident or sunk by enemy attack near Espiritu Santo, after 23-08-1943
43The dummy for the naval budget of the.
139Kure Naval Arsenal07-06-193910-04-194006-11-1941Probably lost in an accident or sunk by enemy attack east of the Philippines, after 27-10-1944
140Sasebo Naval Arsenal05-07-193906-06-194024-02-1942Sunk by and in the Maldives at on 12-02-1944
141Mitsubishi, Kōbe Shipyard25-09-193917-12-194006-02-1942Sunk by north of Rabaul at on 17-05-1942
142Yokosuka Naval Arsenal20-09-193929-09-194027-02-1942Sunk by south of Sabtang Island at on 26-07-1944
143Kure Naval Arsenal07-06-193917-09-194028-02-1942Sunk by a mine at Singapore on 13-10-1942
144Yokosuka Naval Arsenal06-12-193913-03-194130-05-1942Sunk by and at Attu Island on 13-05-1943
145Sasebo Naval Arsenal20-01-194017-12-194026-04-1942Sunk by and USS PT-1135 northeast of Wotje Atoll on 24-03-1943
146Mitsubishi, Kōbe Shipyard01-02-194001-05-194110-06-1942Lost in an accident at Truk on 26-09-1942. Salvaged and repaired starting 29-12-1942. Later, lost in another accident at :ja:伊予灘|Iyo Nada on 13-06-1944. Salvaged and scrapped starting 28-06-1953
147Sasebo Naval Arsenal09-01-194124-09-194131-08-1942Sunk by at Penang Island on 13-11-1943
148Mitsubishi, Kōbe Shipyard02-09-194024-09-194131-08-1942Sunk by and south of Tarawa on 22-11-1943
149Yokosuka Naval Arsenal04-12-194001-11-194130-09-1942Converted to the Kaiten mother ship on 01-09-1944. Decommissioned on 30-11-1945, sunk as a target off Gotō Islands on 01-04-1946
150Kure Naval Arsenal07-12-194022-10-194110-03-1943Converted to the Kaiten mother ship on 09-09-1944. Sunk by and north of Palau, on 19-11-1944
151Sasebo Naval Arsenal19-06-194115-04-194231-01-1943Sunk by east of Luzon on 12-11-1944
152Sasebo Naval Arsenal19-06-194115-04-194222-04-1943Sunk by west of Makin at on 16-11-1943
153The dummy for the naval budget of the Yamato-class battleships

''Type-B Mod.1'' (''I-40'' class)

Project number S37B. Six boats were planned under the Maru Kyū Programme, all boats were completed. On the outside this class looked the same as the I-15 class; however, they were built from high-tensile strength steel and equipped with diesel engines of a simpler design.
Boat No.BoatBuilderLaid downLaunchedCompletedFate
370Kure Naval Arsenal18-03-194210-11-194231-07-1943Probably lost in an accident, after 22-11-1943
371Kure Naval Arsenal18-03-194210-11-194218-09-1943Sunk by east of the Philippines at on 12-11-1944
372Kure Naval Arsenal18-03-194210-11-194203-11-1943Sunk by southwest of Palau at on 23-03-1944
373Sasebo Naval Arsenal27-04-194225-10-194205-11-1943Sunk by north of Truk at on 15-02-1944
374Yokosuka Naval Arsenal11-06-194205-03-194331-01-1944Converted to the Kaiten mother ship on 22-10-1944. Sunk by,,, and aircraft from north-northwest of Minami Daitō at on 18-04-1945
375Sasebo Naval Arsenal15-07-194206-03-194328-12-1943Sunk by east of the Philippines on 28-10-1944

''Type-B Mod.2'' (''I-54'' class)

Project number S37C. Twenty-one boats were planned under the Maru Kyū Programme and Kai-Maru 5 Programme. Eighteen boats were cancelled in late 1943, because the IJN was setting the as 1945's main submarines.
  • Boats in class
Boat No.BoatBuilderLaid downLaunchedCompletedResultsFate'
627Yokosuka Naval Arsenal01-07-194204-05-194331-03-1944Damaged on 25-10-1944 Sunk on 23 October 1944, by the destroyer escort.
629I-56Yokosuka Naval Arsenal29-09-194230-06-194308-06-1944Damaged USS LST-695 on 24-10-1944
Damaged on 25-10-1944 		Converted to the Kaiten mother ship on 14-11-1944. Sunk by at Kumejima Island, at on 05-04-1945
631Yokosuka Naval Arsenal26-12-194209-10-194307-09-1944Damaged on 28-07-1945 by Kaiten
Sank on 30-07-1945
Damaged on 12-08-1945 by Kaiten 		Converted to the Kaiten mother ship, before completion. Decommissioned on 30-11-1945, sunk as a target off the Gotō Islands on 01-04-1946
633 - 636Cancelled in 1943
5101 - 5114Cancelled in 1943

''V22A Type''

Project number S49A. Eighteen boats were planned under the Kai-Maru 5 Programme. However, all boats were cancelled in late 1943, because the IJN concentrated on production of Type-E submarine from 1945 onwards
  • Boats in class
Boat No.BoatBuilderLaid downLaunchedCompletedFate
5115 - 5132Cancelled in 1943

Characteristics

Footnotes

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