Daredevil Surfer Tackles Largest Wave Ever

Garrett McNamara breaks world record, surfs wave 100 feet high.
2:04 | 01/29/13

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Transcript for Daredevil Surfer Tackles Largest Wave Ever
And finally tonight, get ready for what seems to be the biggest wave ever surfed. As high as 100 feet. And the conquering hero is a 45-year-old man in a young athlete's game. So, how did he do it? Abc's nick watt. Reporter: Yep, that tiny dot IS garrett McNamara. Dwarfed by probably the biggest wave ever surfed by man. I just reached him by phone in portugal. Can you explain to the likes of us what it feels like on that moment in this wave? Oh, you are just going so fast and it really, really similar to snowboarding down a giant mountain and you're just chattering and just flying down this bumpy, bumpy mountain. Your brain's getting rattled. Your whole body is getting rattled. Reporter: At the end of the ride, he was oh, so nearly smashed into the rocks. An honestly say surviv chances were very, very slim. Reporter: And mcnamara, a 45-year old hawaiian, lucky to be living legend, might just have shattered his own world record. A little over 77 feet, set in 2011, also right here off the rugged coast of portugal. Surfing at nearly 60 miles per hour, the ride took less than 30 seconds. Potential record waves are measured using a surfer crouched on a board for scale. Was this a new record? Well, we won't know until the spring. That's when they announce the official measurements for the past year. And just for comparison, the surf here today in ventura, california, is only four or five feet high. So, what do these guys, good, solid surfers, what do they THINK OF garrett McNamara? You got to be out of your mind. That wave is psycho. Reporter: Psycho because off of portugal, boiling brine barrels miles down a chasm the size of the grand canyon. Do you think you are actually insane? You know what? I definitely got to be a little crazy, right? Reporter: Yes you do. Oh yes you do. Nick watt, abc news, ventura, california.

This transcript has been automatically generated and may not be 100% accurate.

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