A sub immobilized on the Atlantic floor is crawling with deadly snakes. David Janssen, Hope Lange. Joe: Ivan Dixon. Kirk: Jason Evers. Nicholson: Charles Knox Robinson. Whitehead: Ben Piazza. Torquale: George Pan. Liz: Sherry Boucher. Ikeda: Robert Ito. Bradley: Bill Mims. Directed by Russ Mayberry.