Austrian adventurer and BASE jumper extraordinaire Felix Baumgartner again pushes back his personal borders when he plunges into Mamet Cave in Croatia's Velebit National Park, successfully freefalling and parachuting into the dark interior for a safe landing on the rugged cave floor. The jump, lasting only seconds, requires absolute timing to survive... this is undoubtedly the most challenging of Baumgartner's exploits so far.
