When an underwater ocean lab is lost in a earthquake, an advanced submarine is sent down to find it and encounters terrible danger.
Ben Gazzara
as Cmdr. Adrian Blake
Walter Pidgeon
as Dr. Samuel Andrews
Ernest Borgnine
as Chief Diver Don MacKay
Yvette Mimieux
as Dr. Leah Jansen
Donnelly Rhodes
as Diver Bob Cousins
Chris Wiggins
as Capt. Williams
Mark Walker
as Diver Dave Moulton
Leslie Carlson
as Brigs, Triton Radioman
Stuart Gillard
as Diver Phil Bradley
Michael J. Reynolds
as Dr. Hal Hamilton
Kay Fujiwara
as Anita, lab technician
