Several cruise ship incidents have made headlines in the past year and a half.
In January 2012, 32 people died when the Costa Concordia capsized off Italy's coast.
In February this year, an engine room fire left the Carnival Triumph adrift in the Gulf of Mexico, with passengers reporting overflowing toilets and human waste running down the walls in some parts of the ship.
In March, the Carnival Dream cut short a Caribbean cruise, with Carnival reporting that the ship's emergency generator failed. And this month, authorities say, a man and a woman on the Carnival Spirit went overboard off Australia's coast; they are presumed dead.