(From the publisher):
It might be a hoax, and it might not be. Blood has been spilled! People are dead! The Man Of Bronze ably confronts a dangerous crackpot scheme that has a baffled world wondering what will happen next.
Fist published in Doc Savage Magazine # 64 June 1938 - written by Lester Dent.
Original title: The Submarine Mystery
Genre: Fiction→ Adventure→ Male-Action/Adventure