Hydro, 2004
In April 2004, 16-year-old Hayley Williams fell off the Hydro ride at Oakwood Theme Park in Pembrokeshire, Wales. Investigators discovered that the attendants had failed to inspect her lap bar to make sure it was secure before the boats took off. So when Williams’ boat got to the top to make its 85-degree fall, the teen fell 100 feet. Rescuers immediately pulled her out of the water, but she had too many life-threatening injuries and did not survive.