Searching for the lost world of Atlantis, Prof. Aitken, his son Charles and Greg Collinson are betrayed by the crew of their expedition's ship, attracted by the fabulous treasures of Atlantis. The diving bell disabled, a deep sea monster attacks the boat. They are all dragged to the bottom of the sea where they meet the inhabitants of the lost continent, an advanced alien race that makes sailors their slaves.
| Directing | Kevin Connor | Director |
| Production | Kevin Connor | Producer |
| Costume & Make-Up | Joan Carpenter | Hairstylist |
| Camera | Alan Hume | Director of Photography |
| Writing | Brian Hayles | Screenplay |
| Sound | Michael Vickers | Original Music Composer |
| Production | John Dark | Producer |
| Production | Allan Foenander | Casting |
| Art | Jack Maxsted | Art Direction |
| Costume & Make-Up | Robin Grantham | Makeup Artist |
| Editing | Bill Blunden | Editor |
| Art | Elliot Scott | Production Design |
| Visual Effects | Roger Dicken | Creature Design |
| Visual Effects | John Richardson | Visual Effects Supervisor |
| Production | Graham Easton | Production Supervisor |
| Camera | Derek V. Browne | Camera Operator |
| Sound | Jim Atkinson | Sound Editor |
| Directing | Ray Frift | Assistant Director |
| Production | Bryan Coates | Location Manager |
| Directing | Doreen Soan | Continuity |
| Art | Alan Cassie | Set Dresser |
| Art | Syd Nightingale | Construction Manager |
| Crew | George Gibbs | Special Effects |
| Art | Bert Hearn | Property Master |
| Camera | Arthur Wooster | Camera Operator |
| Camera | Mike Frift | Assistant Camera |
| Visual Effects | Cliff Culley | Matte Painter |
| Sound | George Stephenson | Sound |
| Sound | Ken Barker | Sound |
| Editing | Rita Burgess | Assistant Editor |
| Costume & Make-Up | Monica Howe | Wardrobe Master |
| Costume & Make-Up | Lorna Hillyard | Wardrobe Master |
| Crew | Marc Boyle | Stunt Coordinator |
