Park visitor Richard Lines said he was on another ride close to Wipeout, when a power cut appeared to affect multiple rides.
Lines said he saw a worker subsequently tending to the ride, which was stationary, and this moment can be seen in video footage shared with the .
The carriages then begin moving again, but within seconds, they can be seen slowly rolling back and forth, before coming to a standstill.
Lines said the fire service used an aerial ladder to free the passengers one-by-one.
“You feel sorry for the ones that were either at the front or the back who were up there for a good three hours – which is a long time,” said Lines, from Wymondham in Norfolk, who was visiting with his two children.
The fire service said by 17:10 they had rescued all 27 passengers and that no-one was injured.