On 5 April 2012 , the '' Anacapa '' assessed the derelict 165 ft Japanese squid fishing boat '' Ryou-Un Maru '' . It had been washed away from its mooring in Aomori Prefecture , Japan , by the March 2011 Tōhoku earthquake and tsunami , and had drifted unmanned for more than one year across the Pacific Ocean before it was discovered . The '' Anacapa '' fired on the ghost ship with its Mk 38 25 mm autocannon , holing and eventually sinking it with fire hoses in approximately 1,800-metre ( 6,000 ft ) of water in the Gulf of Alaska 180 miles ( 290 km ) off the coast of the Alaskan Panhandle
2011 Tōhoku earthquake and tsunami
2011 Tōhoku earthquake and tsunami
USCGC Anacapa (WPB-1335)