Unique Sport: Mixed-Gender Underwater Rugby

This sport first began in Germany in the 1960s, and official World Championships managed by the World Underwater Federation (CMAS) are now held.
Gameplay: In a pool with a depth of 3.5 to 5 meters, teams of 6 players compete underwater.
Features: A special ball that sinks to the bottom is used, and points are scored by placing the ball into baskets (goals) located at both ends of the pool floor.