Glacier wave surfing : Is this the world 's wildest extreme sport ? U.S. surfer Garrett McNamara the first person to ride a glacial swell . `` I was up to my neck in water , looking up at this 90-meter tall glacier , waiting for the ice to break off and hoping that it 'll fall straight into the water -- because if it falls flat you 'll be squashed under it . '' Daredevil also rode biggest glacier wave , 24-meter monster off Portugal . Says he is too ` ` the rush . '' But admits thrill is chasing after glacier waves .
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 glacier wave , 24-meter monster off Portugal . Says he is too ` ` the rush . '' But admits thrill is chasing after glacier waves .