Are cruise ships nuclear powered? No, none. With one possible exception, the NS Savannah was built in 1959 and decommissioned in 1972, she was a primarily a cargo ship with space for 60 passengers.
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Cruise ships ward off pirates by taking a variety of measures. They employ armed guards, use high-tech surveillance systems, and have water cannons to deter any potential attackers. Additionally, they often travel in convoys with other vessels for added protection and security.