Revealing mistake: After the water tentacle sequence, Coffee brings Schoenick back to their bunks to get the submachine gun, so they can take over the rig. The bag containing the gun is stashed behind some pipes up by the ceiling. Watch when he reaches behind the pipes to grab the bag--the pipes move at least six inches. (01:31:57)
Continuity mistake: When the SEALS take over, they lock up the crew. After closing the door on Ed Harris and the shouting Mary Elizabeth Mastrantonio, one of the SEALS hangs a hat over the spyhole. The next time we see the door, the spyhole isn't covered.
Revealing mistake: When the crane falls down in front of the rig and then over the cliff into the abyss it's as if the rig was already just a few yards away from the abyss but when the umbilical pulls the rig again (after Bud says to grab onto something) suddenly there's enough space for the rig to be dragged at least a few hundred yards as if the rig never moved from its touchdown position earlier in the film.
Revealing mistake: Every time the aliens appear anything electrical shuts down but somehow Lindsay's camera is able to take pictures of the small NTI before the electricity powers back on.
Revealing mistake: When Bud is unscrewing the trigger from the nuke down at the bottom of the abyss, there are no threads on the mechanism to require unscrewing. The part of the device that would have the threads is plainly visible.
Other mistake: When Ed Harris is dropping down the Abyss there are a couple of time that bubbles come out of his mouth or can be seen in his nostrils, even though he is supposed to have been breathing liquid for quite some time. (02:13:28)
Plot hole: Water pressure seems to be very picky in this film. It crushes Little Geek after passing 17,000 feet but somehow manages to leave Big Geek intact. Also if Big Geek could fall that amount of distance before imploding then why did Flatbed implode after only falling a few feet?
Revealing mistake: When he's on his way to send the nuke down the abyss, Coffee leaves the other SEALs to guard the rig's crew in the kitchen. He goes through a door, locks it and secures it with his belt, and then bangs on it to test its security. It moves more than a metal door in a metal housing would. (01:37:43)
Factual error: When disarming the nuke Bud is trying to figure out which one of the two wires to cut. With only two wires running between two separated modules (in the film, one part is unscrewed from the other) any current flowing through one wire must be returned through the other in order to conserved electric charge. Cutting either wire, in this case, will result in breaking the circuit. There is no way for either side of the circuit to detect which wire(s) were cut.
Factual error: When Bud is dropped onto the spacecraft floor by the alien who rescued him, air trapped in his suit comes off in large bubbles. At 18,000 feet bubbles would be compressed so far that they would be BB size. Also, with all the movement Bud experienced on the way down, no air could possibly have remained trapped in the folds of his suit.
Continuity mistake: When Ed Harris gets used to the Liquid Breathing Suit you can see air still in his helmet after he goes in the water. That shouldn't be! The purpose of the suit is to get any remaining air out for it to work. (02:10:25)
Revealing mistake: When the Benthic Explorer is lifted out of the water, the left screw is wobbling in the wind, revealing that it's a model. (02:34:00)
Continuity mistake: When Lindsay turns to see the UFO, she has cables running around her, but in the next shot, no cables.
Character mistake: When Bud is doing mouth-to-mouth on Lindsay, he's not pinching her nose closed, so all the air he's breathing in is going straight out her nose.
Visible crew/equipment: The ship is moving underwater and explosions are going off left and right. The main female character says she is going to check the battery room. As she goes, the camera is in front of her, and its shadow, including a microphone antenna are on her.
Plot hole: Why wasn't the umbilical to the "Explorer" unhooked from the rig after the rig was set down? Everyone knew things were going to get rough with the hurricane coming, so the umbilical should have been taken care of before the hurricane became a factor.
Factual error: During the flooding of the drill rig, Bud's wedding ring saves the day by preventing the barrier door from closing. Even titanium couldn't stop a moving hydraulic barrier, in ring form. It's very hard in terms of resisting scratches, but that doesn't mean it wouldn't deform or crack.
Plot hole: Coffey uses the submersible "Big Geek" to carry the armed nuclear bomb to the NTIs. If Coffey was that desperate to blow up the aliens, he could have much more easily set the timer for 30 minutes, driven one of the submersibles far out over the abyss past the drop-off, and simply dropped the bomb down and let it sink under it's own weight.
Continuity mistake: When the crane breaks off and falls into the water, it JUST misses the rig by a few feet (very visible when they're looking out of the window). Then the crane falls off of the edge and starts to pull the rig. The rig is pulled much farther than the previously shown distance to the edge.
Answer: Roger Ramjet was a 1960's American cartoon character who was extremely patriotic, but dimwitted.
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