Fin. United States Naval Reserve cadet engineer, Lieutenant Peter Noble, is trapped when the submarine he’s in strikes the remains a submerged derelict, but he manages to escape from the sub and discovers that he is somehow immune to the pressures of the deeps and can breathe underwater. He goes exploring and discovers the underwater kingdom of "Neptunia," which he eventually becomes the ruler of.

First Appearance: Daring Mystery Comics #7 (Marvel), Apr 1941. 3 appearances, 1941-1942. Created by Bill Everett.

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