Apparently, some people thought this video was a fake. Ryan went on TV to set the record straight:

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Garrett tells us more about his experience glacier surfing on Surfline.com.
Except from the article: “Me and Ryan Casey from Deep Water Films were filming an Imax movie and he came to me one day going, “Oh my God, I can’t believe I didn’t think about this: we went to Alaska for the last Imax movie in ‘95 and when we were there shooting the glaciers calving, I saw this wave and I can’t believe it. You guys gotta look at it and tell me what you think.”
He showed me the wave and I said, “Let’s do this.” We went up last June, scouted to make sure it was doable — and I went and looked at it all and I was totally in !. You can read the entire article here on surfline.com

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Here is one wave from the Glacier Surfing trip:

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