There are a large number of sports that involve water. The following is a List of water sports, divided by category. These categories are based on the relation of the sports to the water. Some of the sports include only one part related to swimming, as for example Triathlon.
Scuba diving is swimming under water using a (self contained) breathing apparatus
Free-diving is the aim to maximize the depth dived using no breathing apparatus
Underwater hockey is hockey played under water with short wooden curved sticks and a heavy puck. Players wear diving masks, snorkels, and fins, and must surface to breathe while team mates continue the game on the pool bottom.
Water sports can also refer to the practice of Urolagnia, consensual adults going on each other for fun. So far it is not recognized as a formal sport. In New Zealand, publishing (e.g. making available on one's web page) anything containing urophilia is a felony punishable by up to ten (10) years in jail. [1][2][3]