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        Formerly the R.M.S. Atlantis, the S.S. Poseidon is a luxury ocean liner from the golden age of travel, with cabins now refurbished as a single class. The ship is on one of its last voyages in the North Atlantic with the new company, celebrated with a monthlong Christmas voyage from Lisbon to African and South American ports. A few minutes past 9:00 p.m. on December 26, the Poseidon is overturned when it has the misfortune of being directly above the location of an undersea earthquake. The ship capsizes as it falls into the sudden void caused by the quake displacing millions of gallons of seawater.

Starting from the upper deck dining room, preacher Reverend Frank "Buzz" Scott leads a small group of (often unwilling) followers towards the keel of the ship, trying to avoid the rising water level and other such hazards. Those stuck within the dining saloon are unwilling to follow the Reverend, and stay behind.