Glacier wave surfing : The first thing you need to know is that the waves are not very big. U.S. surfer Garrett McNamara the first person to ride a glacial swell . Daredevil also rode biggest ocean wave , 24-meter monster off Portugal . 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 ? U.S. surfer Garrett McNamara the first person to ride a glacial swell . Daredevil also rode biggest ocean wave , 24-meter monster off Portugal . Says he is chasing `` the rush . '' But admits thrill is gone after glacier stunt .