Watch Online Free HD Solarmovies. At nearly 169 feet tall, Verrückt was taller than Niagara Falls. Riders flew down the world's tallest water slide at 70 miles per hour, challenging the laws of physics. Then, on August 7, 2016, 10-year-old Caleb Schwab was decapitated on the ride. What went wrong to cause such a horrific tragedy?