Black Sea – Treasure Hunts by Mananuk is an adventure game made for Game Boy Advance.
You play as a submarine captain who goes on his mission into the deep Black Sea to search for treasures and discover all the secrets that those waters hold. The small bathyscaphe has a very limited oxygen deposit, so you will have to go to the nearby ports to recharge the cylinders. You must be careful not to disturb the inhabitants of the sea if you do not want to end up in the depths of the Black Sea or awaken deadly monsters.