Rikko Maru
| Name | 力行丸 Rikko Maru |
| Ship Type | Tanker |
| Launched/Completed | 1932 |
| Builder | Workman, Clark & Co. Ltd., Belfast, UK |
| Tonnage | 9,181 tons |
| Owner | Japanese Government |
| Loss Date | March 6, 1945 (attacked on August 31, 1944) |
| Location | Keelung Harbor, Formosa |
| Circumstances | Broke in two and sank in a storm after being heavily damaged by torpedo hits by USS Growler and/or USS Sealion (SS-315) on August 31, 1944. |
| Number of Men Lost | 44 crew members |
Submarine Information
| Name of Submarine | USS Growler (SS-215) | Patrol Number 10 |
| Commanding Officer | LCDR Thomas B. Oakley, Jr. | Attack No. 2541 |
Sinkings by Selected Submarines
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