The Seian Maru is a 3,712 tone freighter that was serving the Japanese Navy when she was bombed and sunk by US Navy Aircraft on the 19th December 1944, only 4 days after the sinking of the Oruyko Maru. She was built in 1938, with a length of 351ft and a width of 50ft, and served the Japanese Navy as an anti-submarine net layer and patrol boat, before being re-rolled as an auxiliary tanker.
During her time as an anti-submarine vessel, it is reported that she saw action in May 1942; dropping multiple depth charges near Ambon in the Moluccas (Indonesia), defending herself from air attack, and transported troops from the No.3 Yokosuka ‘Special Naval Landing Force’ from Timor.
It now lies on its port side at a depth of 27m. It suffered severe damage to the midsection when it was sunk and the drama of its demise is evident from the twisted and torn metal of its hull.
One of the less frequently visited dive sites, due to unreliable visibility and frequent restrictions from the harbor authority.