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?
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?
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.
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.
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?
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?
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!
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.
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.
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?
Corrected entry: Didn't anyone think it strange that after initial shark attack that no one of the group wonders where Preach is or mentions him, yet they don't seem a bit surprised when he saves them all?
Corrected entry: How did the sharks know that they could "sink" Aquatica? It was already underwater. Were they genetically enhanced and provided with blueprints on how to do this? The whole concept is flawed. Despite having enhanced intelligence, they would still have to learn that CCTV cameras transmit images to the cast. They could never know that wounding someone would bring a helicopter they could use to sink the structure. The whole concept of the film is based on the, frankly, wrong assumption that being more intelligent makes a creature automatically 'know' more stuff. Well it doesn't. It would just make them more able to learn and understand. So who taught them?
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?
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: In the beginning when the blonde-haired ex convict was in the tunnel surveying the sharks, the sharks co-ordinated an attack in which they both hit the tunnel in the same second. How could they have done this? Becoming smarter does not give them the ability to communicate.
Corrected entry: The sharks cut the electricity for the lights when they were trying to catch Carter. However, when the helicopter comes Brenda is using a spotlight.
Corrected entry: Just before the two sharks simultaneously attack Carter while he is diving through the underwater cage-like corridor with his harpoon we see the rest of the crew monitoring this with the help of tree monitors displaying the pictures of the underwater cameras in the cages (later destroyed by the sharks). The view on the left screen is taken from a camera that keeps moving backwards while Carter swimming towards it. This displayed shot can't be taken by one of the fixed observation cameras.
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.
Corrected entry: Towards the end of the film when Carter is being dragged along by the shark, the shark rams into a wire fence. You can see that half of Carter is dragged through the hole in the fence. When you see the underwater shot of the shark exploding, Carter is to the left of the whole and is within the compound. When Preach calls out to him, he is outside the compund. How did he move so fast?
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: 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: In the scene where the head scientist takes her wetsuit off to electrocute the shark, her wetsuit is soaking wet so it would make no difference if it was made of rubber or not, she should have been shocked as well.
Corrected entry: For the entire wet lab scene, the Mako shark is half-submerged in the pool. We are to assume that sharks only need to be in water to survive. However, sharks must also keep swimming in order to get oxygen-rich water into their gills. Without this, they would drown or suffocate. Certain species, such as the Nurse shark or the Australian Wobbegong, have adapted to remain motionless on the ocean floor for hours at a time. But an oceanic species like the Mako would have died in the wet lab's conditions.
Corrected entry: Toward the end, as people are fleeing the coastline, we see a group of refugees watching a television on a truck alongside the road. They are watching MSNBC. Must have a pretty long cable.
Corrected entry: If these sharks are strong enough to open metal watertight doors, how come they couldn't break through the fencing without sinking the place.
Corrected entry: Sharks are attracted to the smell of blood not the sight of it or something that looks like it. So in the opening scene when the wine is knocked over into the water it shouldn't be a big deal.
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: When Preach gets into the oven the water level is at the middle of the window. The level would be the same inside, it's not air tight.
Corrected entry: Those big sharks can tow a helicopter and yet in the opening scene, when Carter catches this shark, the shark is not able to tow the boat, which the harpoon is towed to.
Corrected entry: When the female doctor gets off the table after electrocuting the shark, she left the wires in the water, therefore when she got off the table she would have been electrocuted through the water too.