“Twenty Fathoms Down” by L. Ron Hubbard
Publication date: September 1934
Original publication: Five Novels
Genre: Action & Adventure
Story description: Recovering gold and emeralds from the ocean floor proves almost fatal for a fortune hunter, as he contends with a savage crew and a beautiful stowaway.
Currently available as part of the Stories from the Golden Age series, in the book Twenty Fathoms Down.