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
as Russ Bogan
Hope Lange
as Elaine Wedell
Ivan Dixon
as Joe Voit
Jason Evers
as Commander Kirk
Charles Robinson
as Lieutenant Nicholson
Ben Piazza
as Lieutenant Whitehead
George Pan Andreas
as Torquale
Sherry Boucher
as Liz McCord
Robert Ito
as Masai Ikeda
William Mims
as Mayne Bradley
Frank Bonner
as Compton
