They've been doing it there for years, Shaun Baker was one of the first, now he is mad, he was the guy that raced hamster in Iceland through the iceberg field on the powered kayak, but those little topolino kayaks they're using are meant for that sort of mad white water. There's plenty on youtube to keep you amused.
Skiing on the underground that's wicked m8 8) I used to slide down the hand rails when I was a kid And they never used to have them signs in the middle witch made them a very long slide :lol: