21. Hydro Water Coaster
A main attraction at Oakwood Theme Park in Wales, the Hydro water coaster took riders up 100 feet and then dropped them to the pool below at speeds of 55 mph.
The Hydro coaster had only a lap restraint, which gave passengers a sense that that they were falling out of the sky. In 2011, the restraints in Hydro were improved and the ride’s name was changed to “Drenched.” The new ride is still a thrill but certainly not as wild as its former version.