Seian Maru is a large freighter located at only a few hundred meters from the waterfront.

Name Dive Site:	Seian Maru
Depth:	15-25m (49-82ft)
Inserted/Added by:	visit_subic_bay
Specifications:

The Seian Maru is located between Alava pier and the end of the airport runway, just outside of the shipping lanes and 150 meters from the USS New York. She ran aground outside of Subic Bay on 17 November 1944. She was refloated, brought into Subic Bay and escorted by a submarine chaser (CH36). She and the submarine were sunk by an aircraft on 19 November 1944.

It is difficult to document the military life of the Seian Maru. Japanese records show that there were at least three ships in use (and sunk) with that name. In addition, records created in the war are often inaccurate. The Naval pilots that sank this ship identified her as merchant tanker. Japanese records show her as having been converted to a tanker and later converted back to a cargo vessel, which she is. The ship is the Seian Maru, this is established beyond any doubt as the name is still faintly visible on the ship's bow.

Built in 1938 along with a sister ship Hokuan Maru, she was 351 feet long and 50 feet wide. Powered by diesel engines she could cruise at 12 knots with a top speed of 13 knots and a radius of 9,500 miles. In addition to her crew facilities, she was capable of carrying nine passengers.

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