McNamara became the first man to ride a glacial swell in 2007 with some help from Kealii Mamala, who towed him on a jet ski (it’s not technically cheating, the practice is known as “tow-surfing”). In a test of patience, the duo waited in freezing waters for 20 hours a day over the course of an entire week until a chunk of ice fell off a 300-foot glacier, creating a nine-story wave. McNamara tells CNN riding the wave was “mind-bending,” and has since found it difficult to “get that rush in the ocean.”
Watch the video above, but be warned: the videographer is in such shock that it’s happening, he can’t help but yell obscenities.