Glacier wave surfing : Is this the world 's wildest extreme sport ? Portugal surfer Daredevil the first person to ride a glacial swell . In 2007 , McNamara became the first person to surf a glacier wave -- a wave created when a 75-meter chunk of ice broke off from a massive glacier in Alaska . Garrett McNamara also rode biggest ocean wave , 24-meter monster off U.S. . Says he is chasing `` the rush . '' But admits thrill is gone after glacier stunt .
Glacier wave surfing : Is this the world 's wildest extreme sport ? Portugal surfer Daredevil the first person to ride a glacial swell . Garrett McNamara also rode biggest ocean wave , 24-meter monster off U.S. . Says he is chasing `` the rush . '' But admits thrill is gone after glacier stunt .