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When the ballast tank valves open, they open by dropping down, which would be impossible with the pressure of the water pressing against it. Regardless of the domino effect of the water flowing, it's tremendous pressure. See more...

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The opening shot of the film is the most expensive shot ever produced using CGI, costing at around $2.5million.
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The UK poster of the ship underwater isn't actually the Poseidon. It's actually the P&O Ferry lines Arcadia II. This is because they hadn't designed the ship when the poster was released.
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According to Entertainment Weekly, the CGI Poseidon is 218 feet longer than the Titanic, which would make it 1100½ feet long, 31½ feet shorter than the Queen Mary 2.
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