Submarine Attack, a Sega Master System title released in Europe, is likely a game themed around underwater battles or exploration. The gameplay could involve controlling a submarine, engaging in combat with other submarines, or navigating through the ocean depths.  More details regarding specific gameplay mechanics or story are needed to describe the experience fully.  The limited information indicates that it could have been a relatively niche title released in Europe.

Submarine Attack (Europe)

Strider (USA, Europe)