Cast
Walter Pidgeon
(1897–1984)
Admiral Harriman Nelson
Robert Sterling
Captain Lee Crane
Barbara Eden
Lieutenant Cathy Conners
Peter Lorre
Comm. Lucius Emery
Joan Fontaine
Dr. Susan Hiller
Michael Ansara
Dr. Miguel Alvares
Frankie Avalon
Lieutenant Chip Romano
Regis Toomey
Dr. Jamieson
John Litel
(1892–1972)
Vice Admiral B.J. Crawford
Howard McNear
Congressman Llewellyn Parker
Henry Daniell
Dr. Zucco
Robert Easton
Sparks
Charles Tannen
CPO Mack Gleason
Mark Slade
Seaman Jimmy 'Red' Smith
Del Monroe
Seaman Kowski
Tony Monaco
Cookie
Skip Ward
Crew Member
Michael Ford
Crew Member
Robert Buckingham
Crew Member (Uncredited)
Jimmy Murphy
Crew Member (Uncredited)
George Diestel
Lieutenant Hodges (Uncredited)
David McLean
Ned Thompson (Uncredited)
Edward Rickard
Officer (Uncredited)
Charles Dierkop
Seaview Pilot (Uncredited)
Art Baker
UN Commentator (Uncredited)
Raoul Freeman
Delegate (Uncredited)
Al Bain
Delegate (Uncredited)
Harry Denny
Delegate (Uncredited)
Esther Ying Lee
Delegate (Uncredited)
George Nardelli
Delegate (Uncredited)
Paul Power
Delegate (Uncredited)
Scott Seaton
Delegate (Uncredited)
Leslie Sketchley
Delegate (Uncredited)
Ray Spiker
Delegate (Uncredited)
Hal Taggart
(1896–1971)
Delegate (Uncredited)
Robert Strong
Delegate (Uncredited)
Directing
Ad Schaumer
Assistant Director
Writing
Irwin Allen
Story
Charles Bennett
Screenplay
Art
Walter M. Scott
Set Decoration
John Sturtevant
Set Decoration
Herman A. Blumenthal
Art Direction
Jack Martin Smith
Art Direction
Camera
Winton C. Hoch
Director of Photography
John Lamb
Underwater Camera
Crew
Johnny Borgese
Special Effects
Paul Stader
Stunts
Fred Zendar
Technical Advisor
Costume & Make-Up
Paul Zastupnevich
Costume Design
Ben Nye
Makeup Artist
Helen Turpin
Hairstylist
Editing
George Boemler
Editor
Visual Effects
L.B. Abbott
Visual Effects
Sound
Bert Shefter
Original Music Composer
Paul Sawtell
Conductor
Alfred Bruzlin
Sound
Warren B. Delaplain
Sound