Kaiyo No. 4, sister ship of Kaiyo No. 6
| Name | 第六海洋 Kaiyo No. 6 |
| Also Known As | Kaiyo Maru No. 6 |
| Ship Type | Oceanographic Research Vessel |
| Launched/Completed | 1943 |
| Builder | Mitsubishi Heavy Industries Shimonoseki Shipyard |
| Tonnage | 277 tons |
| Owner | Imperial Japanese Navy |
| Loss Date | October 31, 1944 |
| Location | 32-50N, 134-21E |
| Circumstances | Sunk by torpedo |
| Number of Men Lost |
Submarine Information
| Name of Submarine | USS Gabilan (SS-252) | Patrol Number 3 |
| Commanding Officer | LCDR Karl R. Wheland | Attack No. 2974 |
Sinkings by Selected Submarines
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