An American submarine leaves Tierra Del Fuego, and one of its crew has secretly brought aboard a container full of poisonous snakes which escape storage and bite key personnel on the submarine, causing an accident that cripples the vehicle so that it drops to the bottom of the Southern Ocean. Worse still, the snakes are still at large on the submarine and complicate the efforts of the crew to escape the sunken vessel.
David Janssen
Russ Bogan
Hope Lange
Elaine Wedell
Ivan Dixon
Joe Voit
Jason Evers
Commander Kirk
Charles Robinson
Lieutenant Nicholson
Ben Piazza
Lieutenant Whitehead
George Pan Andreas
Torquale
Sherry Boucher
Liz McCord
Robert Ito
Masai Ikeda
William Mims
Mayne Bradley
Frank Bonner
Compton
