The Twilight Zone/The Thirty Fathom Grave
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The Thirty Fathom Grave is the second episode of the fourth season of The Twilight Zone, and the one hundred fourth episode overall.
Additional Cast: David Sheiner (Doc), John Considine (McClure), Bill Bixby (OOD), Conlan Carter (Ensign Marmer), Forrest Compton (ASW Officer), Henry Scott (Jr. OOD), Tony Call (Lee Helmsman), Charles Kuenstle (Sonar Operator), Derrik Lewis (Helmsman), Vincent Baggetta (Sailor), Louie Elias (Sailor)
Uncredited: Rod Serling (Host)
In the early 1960's, as a U.S. Navy ship cruises near Guadalcanal in the South Pacific, its sonar detects muted hammering on metal undersea. The eerie sounds emanate from a submarine on the ocean floor, maybe there since World War II. A very nervous crew member (Mike Kellin) on the ship served aboard that sub - and he was its sole survivor.