IJN · SS

Ro-31

Afloat

Small Kaichu coastal submarine. Kawasaki, Kobe. Sank on trials as Submarine No. 70 on 21 August 1923, eighty-eight dead, and was rebuilt. Completed as Ro-31 on 10 May 1927. Mochitsura Hashimoto had her from 30 June 1942 for home-water training. No war patrol is recorded. Struck 25 May 1945 and scuttled off Sasebo on 5 April 1946.

Type	Submarine (SS)
Hull	Ro-31
Builder	Kawasaki, Kobe
Launched	1926-09-25
Commissioned	1927-05-10
Fate	Afloat. First launched on 15 February 1923 as Submarine No. 70 and sank on trials on 21 August 1923. Raised in the autumn of 1924, rebuilt, and completed as Ro-31 on 10 May 1927. Training boat in home waters. Struck 25 May 1945. Still afloat at Sasebo. Scuttled off Sasebo on 5 April 1946, not in the 1 April scuttling off the Goto Islands.
Command	Hashimoto, Mochitsura Captain from 30 June 1942; Promoted to lieutenant commander on 1 November 1942; The next named captain took her on 16 March 1943. One list ends his tour in February Nakamura, Motoo Captain from 16 March 1943 Kamimoto, Nobuo Captain from 1 July 1943; The boat went into reserve on 31 January 1944

Laid down, displacement, length, beam, draft, speed, and complement are not stored for each hull, so this table leaves them out.

Ro-31 in 1935. The characters on the conning tower are Ro-31. Imperial Japanese Navy photograph, from Maru Special No. 133, Japanese Submarines II. Public domain.

The pictures on this page are the originals.

Command

Hashimoto, MochitsuraCaptain from 30 June 1942Promoted to lieutenant commander on 1 November 1942The next named captain took her on 16 March 1943. One list ends his tour in February MNNakamura, MotooCaptain from 16 March 1943 NKKamimoto, NobuoCaptain from 1 July 1943The boat went into reserve on 31 January 1944

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