I have a question about the "Oceans" video

I was watching Touring Band 2000 the other night as I never watched all of the little extras and stuff. I liked the bit where the band came on stage dressed as the Village People. I hadn't watched Oceans in so long thus put the video on. Question: Do you remember the part of the video where someone goes down a waterfall type of thing in between those tight rocks? The person, whomever it was barely fit in between the rocks. How the f did they do that and where did the tunnel lead to? I got clausterphobic watching that because the guy went head first and it was a tight squeeze and if that didn't lead somewhere they're screwed getting out. Anyone? Bueller? Anyone?
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It's at the 1:50 mark. How'd they do that?
http://www.youtube.com/watch?v=1uYmyhmqcaY