There was a water slide at Duinrell amusement park in the Netherlands that operated from 1994 to 2010. It was filled to the brim with water, leaving riders completely submerged throughout their 15-20 second journey. https://t.co/U9opufyTHU https://video.twimg.com/ext_tw_video/1789542091250454528/pu/vid/avc1/870x644/aithg8JvpGL4YyaQ.mp4?tag=12