Ryou-Un Maru under-fire
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High-powered cannon sinks tsunami 'ghost ship'

The US Coast Guard has used cannon to sink a crewless Japanese ship that drifted to Alaska after the 2011 tsunami.

Petty Officer David Mosley said that the weapon was used to puncture holes in the vessel to take on water.

The boat had no lights or power and was viewed as a danger to other ships.

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