El oto dia vi el documental de como la hacian , la prueban los que la construyen..

Meet the Verruckt, a monstrous water slide soon to open at Kansas City’s Schlitterbahn Park. Standing an absurd 168 feet high -- a Guinness World Record for a water slide -- the Verruckt straps riders into a four-person raft and sends them screaming down the near vertical chute at speeds reaching 70 mph. But it doesn’t end with that first drop, because milliseconds after reaching the soaking nadir of this hellride, riders are sent back up a second rise, after which they’ll tumble another 50 feet before arriving in the relative safety of a pool.

https://games.yahoo.com/blogs/plugged-in/take-a-terrifying--first-person-plunge-down-the-world-s-tallest-water-slide-200929820.html

Verrückt = loco.

Asi es, ahi lo dice : In case you were wondering, Verruckt means “insane” in German.