Type A Midget Submarine on display at the Submarine Force Museum, Groton, CT
| Name | 波-50 Ha-50 (HA-51 in Alden) |
| Ship Type | Type A Midget Submarine |
| Launched/Completed | |
| Builder | |
| Tonnage | 46 tons |
| Owner | Imperial Japanese Navy |
| Loss Date | January 17, 1944 |
| Location | 22-34N, 135-46E |
| Circumstances | Lost when Yamazuru Maru was sunk by Seawolf |
| Number of Men Lost | |
| Note | Yamazuru Maru was towing the midget submarine Ha-50, which as also lost when Seawolf sank the ship. Not credited to Seawolf in JANAC. |
Submarine Information
| Name of Submarine | USS Seawolf (SS-197) | Patrol Number 12 |
| Commanding Officer | CDR Royce L Gross | Attack No. 1518 |
Sinkings by Selected Submarines
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