- Paul Staderdirector (underwater)
- Irwin Allencreator
- Norman Katkovteleplay: "Deadly Blackmail" &
- Norman Katkovwriter: "Atlantis Dead Ahead" &
- Norman Katkovwriter: "Duel in the Deep" &
- Preston Woodteleplay: "Deadly Blackmail" &
- Robert C. Dennisteleplay: "Deadly Blackmail" &
- William Keyswriter: "Duel in the Deep" &
- Mann Rubinwriter: "Duel in the Deep" &
- Robert Blochwriter: "Atlantis Dead Ahead" &
- Larry Alexanderwriter: "Atlantis Dead Ahead"
- Robert C. Dennisstory: "Deadly Blackmail" (uncredited)
- Norman Katkovstory: "Deadly Blackmail" (uncredited)
- Jules Vernecharacter from novels 20, 000 Leagues Under the Sea and Mysterious Island (uncredited)
- José Ferrer(as Jose Ferrer)
- Horst Buchholz(as Horst Bucholz)
- Stephen Powers(as Steve Powers)
Rest of cast listed alphabetically
- Tony Dante(uncredited)
- Norman Stevans(uncredited)
- George Washburn(uncredited)
- Irwin Allenproducer
- Richard LaSallecomposer (as Richard La Salle)
- Eugène Louriéart director (as Gene Lourie)
- John H. Andersonset decorator (as John Anderson)
- John Inzerellamakeup artist
- Donald C. Kluneunit production manager
- George E. Swinkpost-production supervisor
- Norman Augustassistant director (as Norman Arthur August)
- Paul Staderdirector: underwater sequences
- Jack E. Ackermanproperty (as Jackie Ackerman)
- Harold Fuhrmanset designer
- Joseph Mussoproduction illustrator
- Al Overton Jr.sound mixer
- Allan R. Pottersound editor
- Chuck Gasparspecial effects
- L.B. Abbottspecial photographic effects
- Michael Cassidystunts (as Mike Cassidy)
- Justin De Rosastunts (as Justin DeRosa)
- Mic Rodgersstunts
- Jimmy Staderstunts (as James J. Stader)
- Paul Staderstunts / stunt coordinator (uncredited)
- Gary Taramanstunts
- Barrett Taylorassistant editor
- Eugene Marksmusic editor
- Dan Wallinmusic scoring mixer (uncredited)
- Herman Rushprogram consultant
- Art Volpertexecutive assistant to the producer
- Arthur Weissproduction executive
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