| "The Thirty-Fathom Grave" | |
|---|---|
| The Twilight Zone episode | |
| Episode no. | Season 4 Episode 2 |
| Directed by | Perry Lafferty |
| Written by | Rod Serling |
| Featured music | Stock; most cues from "The Invaders" |
| Production code | 4857 |
| Original air date | January 10, 1963 |
| Guest appearances | |
"The Thirty Fathom Grave" is episode 104 of the American television anthology series The Twilight Zone. It originally aired on January 10, 1963 on CBS. In this naval-themed episode, the crew of a Navy destroyer hear a mysterious rhythmic noise coming from a sunken submarine.