A game about water currents, map making, and the movement of small objects on the ocean floor. The players would find a book called 'a guide to fish and drowning' which lets them talk to fish and mentions some macguffan on the ocean floor. Each session the players would descend to the ocean floor in a diving bell and do research and mapping of the ocean. They can talk to the fish, who will tell them about which fish are where and why and when they move, etc. The main danger would be drowning obv, but there would be no combat or anything.