The Abyss (1989)

Visible crew/equipment: During Bud and Coffey's fight in the lab, we see a lightbulb swinging from side to side between the two men. If you look closely, you can see a hand (belonging to a third person) pushing the lightbulb. The only people in the room are Bud and Coffey. (01:44:16)

Bud Brigman: The guy is on his own, he's cut off from his chain of command, he's showing signs of pressure-induced psychosis, and he has a nuclear weapon. So as a personal favour to me, could you put your tongue in neutral for a while?!

Trivia: The dead sailor harbouring a live crab, spooking Jammer out of his wits in the sunk submarine, is director James Cameron's younger brother Mike. The scene had to be shot several times to get it right, forcing Mike to hold the live crabs in his mouth, until the cry for "action", before releasing them. At one point he had to crush one with his teeth, as it gave him quite a bit of grief. Brotherly love immortalized.

Question: Is there any truth to the breathing fluid used in the high pressure suit? Is that a technology actually used and is it really possible to breath and survive like that?