Underground trampoline park

In Northern Wales there is a 100 ft and 60 ft wide trampoline park. These parks are becoming popular around the World. What makes "Bounce Below" (the parks name) so special is that it is built in an old underground mine. The temperature inside is 8 degrees Celsius. Because of risk of injury and freezing temperature you have to wear coveralls and a helmet. There are three levels of nets joined by a long tunnel slide. You might think to get to the trampolines you just walk down to them. Not so easy, you have to take a mine car ride to get there. You also have to pay 30 euros to jump for an hour. Interested? In the video shown, a women after an hour of jumping said "I think everybody needs to come and jump here”.