A mighty drama of the sea. (One-sheet poster).
MAN THE LAFFBOATS!
The undercover...underwater war that shattered the sea...and shook the earth !
DEATH Catapulted from the Depths!
SAVAGE PASSIONS aflame in the North Atlantic! Unleashed by treachery...hate...violence!
13 Chapters of Gigantic Thrills!
The Captain Knows Members of His Submarine Crew are Enemy Agents - But Who?