"During regularly scheduled testing of the ship's emergency diesel generator, a malfunction occurred, " Carnival said in a statement.

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It grew out of a committee protesting against American nuclear testing in the Aleutian islands, whose ship was called Greenpeace.

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The federal government required her at one point to do sonar testing in shallow waters to make sure a 17th-century French ship wasn't buried below the sand, she said.

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Moving, assembling and testing ordnance, purifying and storing fuel, organizing the flight deck, mission planning, safely navigating the ship, preparing food, training and performing maintenance on important ship and aircraft systems go on around the clock.

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