Corrected entry: If the crew acknowledges the fact that these sharks have been modified enough to possibly swim backwards, why are they so shocked when it happens?
Corrected entry: The female lead says that when her father was suffering from Alzheimer's, she had to tell him every day that his wife was dead "and watch that knowledge hit him like a train wreck". If he had no memory, why make the poor man suffer like that? Why not just tell him she was down at the shops every time he asked where she was? (00:05:10)
Corrected entry: If these sharks were herding the people to the top of the structure to get them to flood it, why did they keep killing them off? If no one was left who would flood the building?
Corrected entry: The sharks can break through metal, but not the glass in the oven where one of the characters is "hiding". Must be some strong glass...
Corrected entry: When the female doctor strips out of her wet suit to shock the shark, she grabs the flexible metal tubing and yanks it off the wall with no problem. Two problems here. It would take more than a struggle to rip that of the wall. Second, the wires should be in "non-flexible" metal tubing. (However, I am not accustomed to electrical codes for underwater oceanic bases and perhaps the code calls for flex.) Either way, though, it would be impossible for her to simply pull the wires out without much struggle.
Corrected entry: Doesn't anyone watch the Weather Channel? Why was this storm a surprise to anyone? At the very least, the pilot who flew Samuel Jackson to the site would have been made aware of it before he left the airport. Also, why would a facility of this size and type not have a full-time medical provider on-site if they were going to continue to perform experiments through the weekend? Stupid from start to finish. (00:23:20 - 00:34:50)
Corrected entry: Near the start of the movie during an underwater shot, we see a teddy bear sink like a lead weight when it would ordinarily float. (00:02:40)
Corrected entry: At one point in a shaft L.L. Cool J's character throws down a rope to save a few of the characters from the fast rising water. The shot shows them pull back the rope and shut the door. A few scenes later, the rope is hanging down the shaft again. (01:08:25 - 01:12:05)
Corrected entry: In the scene where the cook is trapped by the shark, the water in the kitchen is about waist-high. When Preacher jumps out of the oven, the shark turns to get him and you see that the shark is completely underwater. Those sharks are supposed to be really big, so you should at least see the fin when it's underwater.
Corrected entry: At the end of the movie, Dr. Susan McCallister cuts her hand and jumps into the water to bring the shark closer. All she had to do was stick her hand in the water so the shark could smell the blood and would come closer. Has she done this, she might have lived.
Corrected entry: At the very end of the movie, when the shark is getting out through the fence, it (the shark) backs up. Correct me if I'm wrong, but sharks can't swim backwards, no matter how much gene therapy they've had. Swimming backwards would cause water to surge into their gills, thus killing them.
Corrected entry: Carter calls Scott "Tom" twice after calling him Scott prior, when in the wet lab trying to calm him down after the rich suit gets eaten.
Corrected entry: When McCallister cuts herself and jumps into the water, you see blood in the first shot. Then when she is swimming and wading etc., there is no sign of blood at all. (01:32:25)
Corrected entry: Sharks can swim quite fast (some up to 65kmph). How does Preach, wading at a relatively slow speed, escape the shark the first time he sees it? (00:51:20)
Corrected entry: Considering the huge size of the glass window in the facility and the fact that it is so far undersea, it must surely be several inches thick and therefore able to withstand an immense amount of pressure. Yet it breaks ridiculously easily when the shark rams the lightweight gurney into it from a considerable distance. If it was that easy to break, how come the sharks never tried it before themselves, especially as later in the movie they can knock out heavy steel doors without any effort at all?"
Corrected entry: In the scene where the remaining crew are climbing the maintenance shaft where the debris is falling from the elevator blocking the full way up, why doesn't the elevator itself fall? It's in a bad enough state as it is, so why does it not fall? (01:03:10)
Corrected entry: All winches on choppers have an emergency release in case something like the shark grabbing it happened - why didn't they use it? (00:38:30)
Corrected entry: They are searching for batteries for this real big flashlight and finally find some in the clock. 1. How can such small batteries provide enough energy for the flashlight? 2. How do they fit in? I'd say you need bigger batteries! (01:11:00)
Corrected entry: Anyone notice the shark could break through a steel door in 4 or 5 hits that's made to withstand tons of water pressure, but it takes 6 or 7 direct hits to get through a chainlink fence at the end and never succeeds? (01:29:30)