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: When the shark first smashes the glass with the gurney carrying the man who was first bitten and failed to escape in the helicopter, he releases the gurney about 50 feet away from the glass. How could the gurney maintain its speed underwater? (00:41:00)
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: 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: Several times, the sharks swim backwards to move down a different hallway or change direction. This is an impossible feat for sharks, regardless of their intelligence.
Corrected entry: Near the end of the movie when the three are preparing to exit the sinking building and float to the surface the comment is made that putting the life jackets on will cause them to float to the surface too quickly and their lungs would pop. When you watch them swim to the top, they actually swim faster than the jackets/fire extinguishers go. (01:24:30 - 01:26:50)
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: Am I the only one bothered by Preacher getting bitten so badly he nearly passes out from the broken leg, yet when he is either shooting at the shark and Carter, or setting the wires, he stands easily on his injured leg? At first the leg seems to inhibit him, but it must magically heal as the movie continues. (01:28:55 - 01:34:05)
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: 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: 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: 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: 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)