The Unkai Maru was built in 1905 by the W. Grey Shipyard of England as the freighter S/S Venus. The ship was sold in 1911 to the Japanese Nakamura Kisen Line for use by the Japanese Navy as a general cargo transport. Unkai Maru survived several of the “Hailstone” raids before being sunk. She was struck by an aerial torpedo from planes of the USS Bunker Hill and later by bombs from aircraft launched from the USS Yorktown. The fires and flooding finally put her on the bottom.
The Unkai Maru is one of the oldest ships in the lagoon and was found by Klaus Lindemann in 1980. She now rests at a maximum depth of 140 fsw.
- Displacement: 3,188 tons
- Length: 305 feet
- Beam: 44 feet
- Engine:1 reciprocal steam / coal
- Max Speed: 12 kts.