Trailer
Images
 | Walter Pidgeon as Admiral Harriman Nelson |
 | Robert Sterling as Captain Lee Crane |
 | Barbara Eden as Lieutenant Cathy Conners |
 | Peter Lorre as Comm. Lucius Emery |
 | Joan Fontaine as Dr. Susan Hiller |
 | Michael Ansara as Dr. Miguel Alvares |
 | Frankie Avalon as Lieutenant Chip Romano |
 | Regis Toomey as Dr. Jamieson |
 | John Litel as Vice Admiral B.J. Crawford |
 | Howard McNear as Congressman Llewellyn Parker |
 | Henry Daniell as Dr. Zucco |
 | Robert Easton as Sparks |
 | Charles Tannen as CPO Mack Gleason |
 | Mark Slade as Seaman Jimmy 'Red' Smith |
 | Del Monroe as Seaman Kowski |
 | Jonathan Gilmore as Seaman George Young |
 | Anthony Monaco as Cookie |
 | Skip Ward as Crew Member |
| Michael Ford as Crew Member |
| William Herrin as Crew Member (Uncredited) |
 | Robert Buckingham as Crew Member (Uncredited) |
| Richard Adams as Crew Member (Uncredited) |
 | Jimmy Murphy as Crew Member (Uncredited) |
| George Diestel as Lieutenant Hodges (Uncredited) |
| Larry Gray as Dr. Newmar (Uncredited) |
 | David McLean as Ned Thompson (Uncredited) |
| Edward Rickard as Officer (Uncredited) |
 | Charles Dierkop as Seaview Pilot (Uncredited) |
 | Kendrick Huxham as UN Committee Chairman (Uncredited) |
 | Art Baker as UN Commentator (Uncredited) |
| Rodger Terry as Guard (Uncredited) |
| Brad Brown as Guard (Uncredited) |
| Raoul Freeman as Delegate (Uncredited) |
 | Al Bain as Delegate (Uncredited) |
| Harry Baum as Delegate (Uncredited) |
| Benjie Bancroft as Delegate (Uncredited) |
| Michael Cirillo as Delegate (Uncredited) |
| Harry Denny as Delegate (Uncredited) |
| John Giovanni as Delegate (Uncredited) |
| Bhupesh Guha as Delegate (Uncredited) |
| Esther Ying Lee as Delegate (Uncredited) |
| Robert Locke Lorraine as Delegate (Uncredited) |
 | George Nardelli as Delegate (Uncredited) |
| Paul Power as Delegate (Uncredited) |
| Paul Ravel as Delegate (Uncredited) |
 | Scott Seaton as Delegate (Uncredited) |
| Leslie Sketchley as Delegate (Uncredited) |
 | Ray Spiker as Delegate (Uncredited) |
| Hal Taggart as Delegate (Uncredited) |
| Robert Strong as Delegate (Uncredited) |
| Ron Nyman as Crew Member (uncredited) |
| Editing | |
| George Boemler | Editor |
Sound | |
| Bert Shefter | Original Music Composer |
Camera | |
| Winton C. Hoch | Director of Photography |
Costume & Make-Up | |
| Paul Zastupnevich | Costume Design |
Directing | |
| Irwin Allen | Director |
Art | |
| Walter M. Scott | Set Decoration |
| Herman A. Blumenthal | Art Direction |
Writing | |
| Charles Bennett | Screenplay |
Art | |
| Jack Martin Smith | Art Direction |
Writing | |
| Irwin Allen | Screenplay |
Art | |
| John Sturtevant | Set Decoration |
Sound | |
| Paul Sawtell | Original Music Composer |
Production | |
| Irwin Allen | Producer |
Sound | |
| Alfred Bruzlin | Sound |
| Paul Sawtell | Conductor |
Production | |
| Al Gail | Producer's Assistant |
Crew | |
| Jim Martell | Transportation Coordinator |
Visual Effects | |
| L.B. Abbott | Visual Effects |
Crew | |
| Paul Stader | Stunts |
| Johnny Hagner | Stunts |
Directing | |
| Ad Schaumer | Assistant Director |
Sound | |
| Warren B. Delaplain | Sound |
Crew | |
| Zale Parry | Stunts |
| Fred Zendar | Technical Advisor |
Sound | |
| Max Reese | Orchestrator |
Costume & Make-Up | |
| Ben Nye | Makeup Artist |
Camera | |
| John Lamb | Underwater Camera |
Costume & Make-Up | |
| Helen Turpin | Hairstylist |
Writing | |
| Irwin Allen | Story |
