Marco Mevoli hoped to reach a depth of 100 meters . He lost consciousness after he surfaced . The South Florida Dive Journal breaks down the steps to freediving , from lowering your heart rate to gliding `` with virtually no exertion . '' Scientists are trying to figure out what happened .
Marco Mevoli hoped to reach a depth of 100 meters . He lost consciousness after he surfaced . Scientists are trying to figure out what happened .