Underwater-Rugby is a ballgame played in a swimming pool of approximately 4-5 meters depth, where the playing "field" consists of the entire 3D-watermass. Each team consists of a least 4 players per side (everyone welcome). The goal (pun intended) is to put a ball into a round metal-basket on the bottom at the opposing team's end of the "field". Yes, the ball sinks. One of the things that makes this sport unique, is the 3D-aspect.
The tactics become more complex when introducing more freedom of movement. The ball is passed under water. Players are equipped with divers mask, snorkel, fins and water-polo hoods with ear-protection. UW-Rugby is a contact sport, but the rules and the environment (water) prevent severe injuries. The occasional bruise or scratches are the only usual "side-effect" of this game.