Revealing mistake: When the shark first attacks and bites off Jim's arm, you can see his real arm under his shirt as he's scrambling away from the water. (00:34:10)
A group of scientists have a deep-sea research facility called Aquatica. In the facility, they have discovered that there is an enzyme in shark brains that can re-activate human brain cells. They have three sharks: two "small" Gen I Mako's and a massive Gen II Mako, about 25 feet long. They have had to increase the shark's brain mass to get the enzyme, but the sharks are smarter as a side-effect.
Suddenly, during a storm, the sharks cause an accident which sparks off a chain of events which starts to sink Aquatica. The small group of humans then need to find a way out before they are killed.
Russell Franklin: You think water moves fast? You should see ice. It moves like it has a mind. Like it knows it killed the world once and got a taste for murder. After the avalanche, it took us a week to climb out. Now, I don't know exactly when we turned on each other, but I know that seven of us survived the slide... And only five made it out. Now we took an oath, that I'm breaking now. We said we'd say it was the snow that killed the other two, but it wasn't. Nature is lethal but it doesn't hold a candle to man.
Trivia: Director Renny Harlin has a cameo as one of the employees of Aquatica who are leaving the facility for their weekend break in the opening scene.
Question: Was there supposed to be some more of the scene between Carter and Susan after she had killed the third shark?
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