A grandfather of six became the first to experience the longest zip wire in the northern hemisphere.
Robert Davies, 68, who lives near the new attraction in Penrhyn Quarry, Bethesda, North Wales, described whizzing down the mile-long zip wire suspended 700ft in the air as "one of the most amazing things I've ever done".
"I was just doing some part-time work in the office on the site and all of a sudden they said I would be going down the wire so I didn't have time to think about it," said the former construction worker.
"I was a bit apprehensive when I got up there but not scared. It really is an amazing view and when you are flying through the air at 95mph it is a fantastic feeling. I would absolutely recommend it as it is something different. You could hear me screaming the whole way down!"
Zipwire Snowdonia officially opens to the public on Saturday.
Thrill seekers can enjoy a Jeep ride with commentary of the history of the quarry on the way to the start point of the wire, named The Big Zipper, which also has a smaller version called The Little Zipper which form the two attractions of the Zip World site.
Seb Thompson, marketing manager for Zipwire Snowdonia, said: "It's a really exhilarating experience that you don't get anywhere else.
"We're hoping it's going to be really popular and put North Wales on the map as the UK's number one adventure location."