Freediving, free-diving...
Free diving or skin diving is a form of underwater diving that
relies on divers' ability to hold their breath until resurfacing
rather than on the use of a breathing apparatus such as scuba
gear.
Examples of freediving activities are: traditional fishing
techniques, competitive and non-competitive freediving,
competitive and non-competitive spearfishing and freediving
photography, synchronized swimming, underwater football,
underwater rugby, underwater hockey, underwater target
shooting and snorkeling. There are also a range of "competitive
apnea" disciplines; in which competitors attempt to attain great
depths, times, or distances on a single breath.
(Historically, the term free diving was also used to refer to scuba
diving, due to the freedom of movement compared to surface
supplied diving.)
Sport Diving is an underwater sport that uses recreational open
circuit scuba diving equipment and consists of a set of individual
and team events conducted in a swimming pool that test the
competitors’ competency in recreational scuba diving technique.
The sport was developed in Spain during the late 1990s and is
currently played mainly in Europe. It is known as Plongée
Sportive en Piscine in French and as Buceo De Competición in
Spanish.