"It's hard to put into words what it's like when you see somebody die." Chilling words, but that's what kayaker Rush Sturges genuinely thought he was watching when his friend Jordy Searle got sucked under this rock.

The first time we watched this video we genuinely did a double take too - was this in fact a snuff film?

Was this in fact a snuff film?

The relief we felt when we saw Jordy's head pop up was palpable, and that's just watching the video. Imagine what it must've been like for the crew who were with him. But those long seconds when he's disappeared completely under the rock... they just don't bear thinking about.

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