Throughout the movie Naval personnel are shown wearing their covers (hats) indoors. In the U.S. Navy covers are only worn indoors if a person is on watch, therefore almost every occurrence in the movie is incorrect.
When the sailors are in the pressure chamber about 16 minutes into the film, they are told that they will be subjected to "50 pounds of pressure, corresponding roughly to the pressure of the depth of about 100 feet." Atmospheric pressure (1 ATM) is 14.7 pounds per square inch (psi) at the surface and increases by 1 ATM for every 33 ft. of water (i.e., 30 psi at 33 ft., 45 psi at 66 ft.). Therefore, 50 pounds of pressure would be approximately 3.33 ATM, or roughly 77 ft.