Plot hole: The survivors find their way to the internet lounge to send out a message via email about the terrorist attack. The ship was upside down. All satellite dishes used to transmit over the internet were completely submerged in water. Even if there was power to the computers, they would not have been able to get a server connection let alone send out email.
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Other: Watch as the little boy is suppose to be unscrewing the screw with the cross necklace when they are stuck in the vent. You can see that it is not the hand of a child but of an adult.
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