Pro surfer Makai McNamara is currently in a coma after a "freak accident" in Hawaii, according to reports.
The frightening moment happened at the North Shore of Oahu ... where McNamara, 29, was surfing at his usual spot, the Banzai Pipeline -- which is known for being a dangerous location.
McNamara was struck by a large wave during his run ... which knocked him unconscious and sent him headfirst into a reef, fellow surfer Eli Olson told an outlet.