Charlton Heston is the Captain of the "USS Neptune", a nuclear submarine returning to port after his final mission in command. Whilst running on the surface they collide with a Norwegian boat with faulty radar and sink deep down into the Atlantic and end up perched precariously on a ledge prone to rockslides. It's now a race against time to rescue the seamen and Stacy Keach ("Capt. Bennett") is drafted in to lead the rescue with the help of "Capt. Gates" (David Carradine) who brings his revolutionary "Snark" DSRV to the scene of the accident. As usual, there are personality clashes a plenty; pa... read the rest.