Hawaii scuba divers ask quit often, how did the Yo-257 shipwreck get sunk? The truth is, she is the casualty of the Imperial Japanese Navy... sunk this marvelous little ship in 1945. No, the truth is, the Atlantis Submarine company of Hawaii bought the rights to the Yo-257 ship. Through tons of messy paper work, payoffs and the usually strip-down and clean up routine. The Yo-257 ship was bought in 1988 and finally sunk in 1989 becoming a true Oahu shipwreck.
The Yo-257 does have some interesting history. You can read more from her former crew member, Fred Goodwin, LT, USCG Re. She was an oiler boat, meaning she fueled other ships out to sea. Her primary role was fueling battleship groups back in WW2. So in fact the Yo-257 shipwreck does have some war history. Light armament was onboard this ship with a 60 caliber machine gun mounted on the stern area of the ship. Although official records of the Yo-257 state that she was never in direct lines of fire crewmembers have said otherwise.
The Yo-257 sits in approximately 120 feet of water with her bow facing 180 due south. The main decks sit at 85 feet from the helm to the bow section then the bow abruptly rises with a small deck at 75 feet. There you can still see that old hoist that was used to secure the Yo-257.
YO257 Operational Period September 16, 1963 through November 12, 1963. During this period Coast Guard Personnel were assigned additional temporary duty aboard the Navy YO-257 on loan from the Navy. The YO-257 also helped to establishment of a LORAN A-C Station in Yap and Western Caroline Islands. Prior to the Coast Guard acceptance and during the operational deployment of the YO257, the General clean up, fitting out for sea and maintaining the YO257 in a state of operational readiness required extensive effort from the assigned crew. The YO-257 wasn't equipped to take on the 400 mile trip from Guam to Yap. No radar or other navigational equipment was on board. Basically the bare essentials. Star navigation was the way to navigate her.
Each afternoon a military plane would fly over and give the YO-257 the needed course corrections. Can you imagine how much money GPS now saves ocean going boats?
The ship could only carry enough water for drinking. On the stern of the Yo-257 a rear gun mount was sealed and a shower head installed in order to give the crew members some added relief from the sweltering tropical sun and showering of course. When the gun mount was empty, the crew utilized the afternoon rains which are common in this part of the world.
The Yo-257 carried water based asphalt to be used for making runways that planes using the new LORAN A-C Station could use. In essence this ship was used in the making of many runways in the South Pacific. Living conditions on the Yo-257 were not as high as other Navy vessels. Parts for the ship and common goods you would regularly find on other Navy ships such as lockers and bunks were removed from Navy ships moth balled in Guam.
The YO-257 decks in immaculate condition as see in this photo back in 1963 off of Yap Island.