Take a look at the worst cruise ship disasters in recent history.
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More than 350 of the 1,800 total passengers began to began to vomit and complain of diarrhea and upset stomachs aboard Caribbean cruise ship Celebrity Mercury in 2010. It was unclear what caused the outbreak, though Norovirus is often blamed for the spreading of such symptoms in close quarters. Cases of the same illness were reported on the Celebrity Mercury after this incident. Later that year, Celebrity Cruises announced Celebrity Mercury was leaving the fleet.