The Seian Maru was built in 1938 along with her sister ship the Hokuan Maru by ship builders Tama Zosensho K.K Tamano. She was built as a merchant cargo liner but her time in civilian service was short lived as the ship was requisitioned by the Imperial Japanese Navy in September 1940 and classified as an anti-submarine net layer and patrol boat. The vessel was then re-classified in August 1942 as an auxillary transport and then again in January 1943 as a emergency tanker.
Depth: 16-27m / 53-89ft
Diver Level: Advanced Open Water
TECHNICAL SPECIFICATIONS:
Length – 106 metres
Width – 15.24 metres
Draught – 7 metres
Displacement – 3712 tonnes
Engine – 1 x Mitsui B & W diesel engine, 1 x propeller
Power – 1400 horsepower
Speed – 13 knots.