Underground trampolines -- jumping high, far below

Visitors to Llechwedd Slate Caverns -- a tourist attraction near the Welsh mining town of Blaenau Ffestiniog -- will soon have the opportunity to jump on three massive trampolines that can only be reached by first hopping into a small train and heading deep into an underground cavern.

This new fun-spot is called Bounce Below and is the brainchild of entrepreneur Sean Taylor.

"It's a one-hour activity where customers get dressed up in a cotton overall and given a helmet, they then jump on a train and travel inside the mountain. They then disembark into a cavern twice the size of St. Paul's Cathedral," he said in a recent webchat.

"There are three giant trampolines with three meter net walls to stop people climbing out, each trampoline is linked by a slide to go down and a walkway to go up, the biggest slide is 60 feet. From the bottom platform you then go on a net walkway with a spiral staircase coming out on the other side of the railway line."

Taylor, who also operates extreme zip line courses called Zip World, calls his latest endeavor "unique" and noted that it also includes a light show.

"Nowhere else in the world can you do this kind of thing," he said.

To create this unusual year-round adventure, workers spent five months in the dark digging out the cave by hand, with only the glow of their portable lamps as their guide.

Want to catch some air on the world's first underground trampolines? Bounce Below is set to open July 3.

(Via Daily Post)