The Twilight Zone - The Thirty-Fathom Grave

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