The Titanic, which sank in the North Atlantic on April 15, 1912, had two sister ships almost identical in size and luxury: the Olympic and the Britannic.
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Had the Titanic sank in warm water, most of those in the water would have survived. Almost all had life jackets on, and the lifeboat passengers were rescued only a couple of hours after the ship sank. Passengers of sunken cruise ships can't survive indefinitely though unless the water is tropical.