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  HA-37 Type A Midget Submarine
Type A
Kō-hyōteki kō-gata

46 Tons (surfaced)
47 Tons (submerged)
78.5' x 6' x 10.2'
2 x Type 97 torpedo
140kg scuttling charge

Submarine History
Built by Karasukojima Naval Armory as the 37th Type A Midget Submarine completed. Delivered to the Imperial Japanese Navy (IJN).

On November 13, 1942 Japanese submarine I-20 embarks this midget submarine and departs Truk bound for Guadalcanal. That same day returns to Truk because the midget submarine suffered a malfunction.

Mission History
On November 19, 1942 at 3:00am Japanese submarine I-20 launches HA-37 roughly six miles off Cape Esperence on Guadalcanal. Aboard is commander Lt(jg) Miyoshi Yoshiaki with crew member PO1C Umeda Kiyoshi.

A few minutes later, HA-37's steering system develops a serious oil leak but continues on the surface but fails to sight any targets. At 6:55am, scuttled off Cape Esperence on Guadalcanal.

Fates of the Crew
Miyoshi and Umeda escape ashore and join Japanese forces on Guadalcanal.

Possibly, this submarine might be Type A Midget Submarine (Cape Esperence 1945). On January 4, 1945 USCGC Ironwood (WLB-297) began salvaging this submarine from a depth of 30' off Cape Esperence on Guadalcanal. Divers, working from a small boat, use a hose and crowbars to clear a space under the bow and stern of the submarine. On January 9, 1945 a chain sling is rigged around the bow for salvage. The identity of this 1945 salvaged midget submarine is unknown but possibly HA-8, HA-22 or HA-37.

Combined Fleet - Midget Submarines in the Solomon Islands 1942

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Last Updated
May 22, 2017


November 19, 1942


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  Pacific Wrecks Inc. is a non-profit 501(c)(3) charity dedicated to bringing home those Missing In Action (MIA) and leveraging new technologies in the study of World War II Pacific and the Korean War.  
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