The Underwater Water Slide: Fly Over at TikiBad
Have you ever wished to experience being transferred from one pool of liquid to another via a pipe? Had you visited the Dutch water park known as Tiki Bad before 2010, you would have had the chance.
The Fly Over was an underwater water slide, which is exactly how it sounds, and transported riders from one pool to another. Built in 1994, riders dove underwater to access the slide, using gravity to transport them upwards via the Communicating Vessels Principle. Riders would be completely underwater for about 15-20 seconds.
This is how I image those 15-20 seconds sounded like.
The slide was built to drain water in five seconds or less in case a rider got stuck, but the threat that a panicked rider may inhale water still remained. In spite of safety concerns however, there were never any reported incidents with the ride.
Nonetheless, it was met with little enthusiasm and fear from the general public, and was closed in 2010 due to the maintenance costs associated with it.
Theme Park Crazy YouTube video of the ride: The slide is at 6:40 mark.