It takes places in giant tubs which are individually powered, to travel
around a concrete path, with wooden walls either side forming a sort of
trough. You start by being powered up a small hill, before descending down a
series of paths and tight turns. It's like something you could make in your
back garden if you had enough space and a JCB.
The really mad bit is when the tub starts spinning. There are bits round the
track where you start spinning wildly, and other sensors that bring you to a
sudden halt. It creates an exciting, mad and hard to predict experience.