Writer:	Richard Landau
Director:	John Brahm
Star:	Richard Basehart (Admiral Nelson),  David Hedison (Captain Crane)
Recurring Role:	Henry Kulky (Curley Jones),  Robert Dowdell (Chip Morton),  Del Monroe (Kowalski)
Guest Star:	Peter Brocco (Xanthos),  Al Ruscio (Dimitri),  John Alderson (Round-Face),  Linda Cristal (Melina),  Hurd Hatfield (Zeraff),  Mark Slade (Malone),  Peter Mamakos (Nicolas)

According to Mark Slade, who played a background crew member in a number of episodes, they were preparing to shoot a scene where the Seaview was hit by a torpedo when Richard Basehart insisted on seeing the explosive special effects go off first, although it would cause a delay in filming. The effects were set off and blew out a huge chunk of the sub's deck, right where the actors would have been standing. Basehart began singing, "There's No Business Like Show Business", and went off to lunch. (edit) Hurd Hatfield is best known for his star turn in the title role of the classic film "The Picture of Dorian Grey". (edit)

(The minisub is being prepared)

Nelson: All set, Curley?
Curley: Set like she's off on her first date, Admiral. (edit) Zeraff: Up there, I am nothing. I am a snail. But down here, I am a shark.
Crane: Mister, in my book, you are a man-eating piranha!
Zeraff: Thank you, Captain. I'll accept that as a compliment. (edit)

During the closeup of the dead diver in the Seaview's net, you can see the man blink. (edit) Uncredited roles:

Joey Walsh (Atlas), Dennis Cross (Operator), Athan Karras (Clerk), Paul Kremin (Georgio) (edit)

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