Goofs

Right after Gail had the voodoo encounter in her hotel room, we see Sanders (Nick Nolte) sitting and talking with Treece. He is toying with a cigar in his fingers. The cigar is wrapped in its protective plastic/cellophane wrapper. The view goes to a closeup of Sanders running the cigar under his nose to smell it, and we see the cigar is clearly bare - no longer wrapped in its plastic wrapper. Then the camera angle goes back to the long shot, and Sanders is once again toying with the cigar, only now it's in the cellophane wrapper.

When David and Romer are talking in Romer's living room, David's hair is messy and over his forehead. Later, David's hair is combed and neatly presented.

In the long shot of the explosion at the end, the blast is seen rocking the boat David and Gail are on, but in the following close-up shot of them watching back from the boat, it's seen to be sitting in calm waters.

In the beginning of the movie when Gail finally manages to free herself after being pulled hard against the hull of the ship a couple of times, she extracts the dive stick that was attached to her arm, and it is whole and undamaged. However, a second later, the diving stick falls to the sea floor, apparently bitten in half.

From 1:01-1:03, Treece is speaking with Gail and David. Seen on Treece's right (from a few angles) is a small table with, from left to right, a wine decanter, silver pitcher, spirit decanter and a drinking glass closest to him. Then at 1:04, when David goes to bed, and Gail and Treece continue speaking, the order of the items on the table has completely changed. It is now the silver pitcher, spirit decanter, wine bottle and drinking glass.

In an underwater scene, a grenade goes off accidentally. The shock wave would have killed everyone in the vicinity.

At the end of the movie after the ship is destroyed by an underwater explosion, the scuba diver comes to the surface with an artifact. No person would survive in the water when such an explosion occurs. The shock wave from the explosion passes directly through the body and ruptures hollow organs and spaces such as the bowels, lungs. ears, and sinus cavities. Thousands of sailors have died at sea under these circumstances. The movie The Cruel Sea (1953) correctly illustrates such an event.

Severing a deep sea diver's airline whilst he is on the sea bed does not automatically flood the entire suit with sea water - a valve in the helmet prevents that and had long been invented by the 1970's.

In one or two scenes, two scuba divers in the wreck pop up into an air space and have a conversation. It's not likely that a shipwreck under water for 30 or more years will have any air bubbles still in it.

Where Nick Nolte is inside the shipwreck looking at a small school of big-eyed red fish (around 42 minutes), the fish are shown upside down, then the shot goes to Nolte (upright), then back to the fish correctly shown upright.

When Treece, Berke and Sanders are heading over to the wreck (the first time, just before they discover the three barrel lock escutcheon plate), Treece appears to be looking towards Berke, but he's talking to Sanders - Sanders even turns to face him, but Treece is still looking in Berke's direction.

In one of the underwater scenes, Treece refers to the girl as "Kate," when the character's name is "Gail."

Cloche made a deal to give Treece one million dollars for collecting all the morphine ampules, and it's said Cloche would still double his money.. It never determined how many ampules there are, so Cloche might be paying a million dollars for 4 or 5 thousand ampules which wouldn't be worth anything close to two million dollars.