Résumé (jaquette) : For the crew of a military submarine, a most dreaded nightmare has come true: their ship ìs trapped underwater with appaiently no chance of escape! David Janssen and Hope Lange star in this taut, edge of the seat thriller. While on a mission with a team of international researchers, the sub becomes wedged in a rock formation 1,000 feet below the ocean's surface. Russ Bogan (Janssen), the ship's chicf masier-at-arms, takes control of the crippled vessel after most of the crew and researchers are decimated by an unknown terror. It is later learned that several poisonous snakes have been brought aboard by a member of the crew. When all attempts to free the sub from the entrapping rock fail,
Bogan and a crew of divers don their underwater gear and tight the treacherous currents to plant explosive charges that will either free the sub... or seal its doom!
