The Antipod crew, including Maxime Charveron, Luc Legrand and Mattias Dandois, were in Australia recently filming for the soon to be released ANTILOOP video.
They had been talking about how possible it would be to ride a vertical tunnel and when rumours reached them of such a set-up near New South Wales they decided to give it a go.
We probably should point out that it was no coincidence that when the guy without a helmet on tried it he burst his head open. Stay safe, kids!