This striking cover is from 1957. I've dived quite a few wrecks over the years without ever being attacked by a Moray Eel so I'm going to answer the question posed on the cover with "sport".
This piece is signed "Steel" but I have no more information so if anyone knows anything about the artist please let me know. (Click for a larger image).
This piece is signed "Steel" but I have no more information so if anyone knows anything about the artist please let me know. (Click for a larger image).