Relacionar Columnas extreme sportsVersión en línea Vocabulary introduction por Silke De Keyser 1 Big wave surfing is a discipline within surfing in which experienced surfers paddle into or are towed onto waves which are at least 20 feet (6.2 m) high 2 a form of undersea diving in which the diver enters the water through a hole cut in the ice 3 the sport of snowboarding on mountains or glaciers accessible only by helicopter or skiplane 4 BASE jumping is parachuting or wingsuit flying from a building, an antenna, a span, or the Earth (cliff).