These extreme sports entusiasts are BASE jumping. Base jumping, abbreviated as B.A.S.E jumping, is an extremely dangerous activity where participants jump from fixed objects, free fall for a length of time, and finally use a parachute to break their fall. Therefore, `BASE` tells it all. It is an acronym that stands for the four categories of objects from which one can jump - buildings, aerials (balloons, blimps, etc.) spans (bridges), and earth (cliffs).
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