Tonan Maru (then known as SS Opawa)
| Name | 図南丸 Tonan Maru |
| Former Names | SS Opawa, SS Antarctic, Antarctic Maru |
| Ship Type | Whale Factory/Cargo/Auxiliary Oiler |
| Completed | 1906 |
| Builder | William Denny & Bros., Ltd. Dumbarton (UK) |
| Tonnage | 9,866 tons |
| Owner | Nippon Suisan K. K. |
| Loss Date | November 28, 1943 |
| Location | 12-46N, 109-42E |
| Circumstances | Sunk by torpedo |
| Number of Men Lost | 84 crew members |
Submarine Information
| Name of Submarine | USS Bowfin (SS-287) | Patrol Number 2 |
| Commanding Officer | LCDR Walter T. Griffith | Attack No. 1356 |
Sinkings by Selected Submarines
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