Plot: After The Poseidon Adventure (1972), in which the ship got flipped over by a tidal wave, the ship drifts bottom-up in the sea. While there are passengers still on-board waiting to be rescued, two rivalling salvage parties enter the ship on search for money, gold, and a small amount of plutonium.
Alternative Plot: Disaster movie sequel following two groups of adventurers as they race to salvage a doomed ship's treasure hours after it has been crippled by a tidal wave. When the gold-diggers enter the overturned liner through a hole cut by the coastguard they discover more survivors still trapped on board and struggle to carry out their plans before the ocean finally claims the wrecked vessel.
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