Wingsuit and BASE-jump athlete Alexander Polli performs an incredible flight through a narrow cave on a rugged mountainside located in Roca Foradada Mountains in Montserrat, Spain. He begins the flight by jumping from a perfectly good helicopter, accelerates to 155 mph, and then flys through the narrow cave, no wider than Alexander is tall. Needless to say, Wingsuit flying is an extreme sport that’s best left to the professionals who only have one chance to get a flight like this right.
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