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London's first indoor potholing experience is opening this spring as part of a new £1.8 million adventure centre coming to East Ham.

Participants will descend into a twisting 100-yard network of dark pathways and caverns created under the new Flip Out trampoline park.

The challenge is finding the right path to the end of the cave and back to the surface. Flip Out London E6 will have 12 themed climbing walls, including ice and volcano ones, a super-slide with a near-30ft drop and two floors of trampolines. There will also be a laser-quest area and a “Ninja Warrior” assault course zone.

Flip Out, on the site of the former Granada theatre, will be the UK’s first trampoline park with both an indoor caving experience and a super-slide.

MD Jon Inwards said: “The arena will be packed with fun. As well as the usual thrills synonymous with trampolining, the site will give people the chance to experience something extra-special with indoor caving.

“This is not only a first for London but also for Flip Out. I’m sure visitors will thoroughly enjoy the whole experience.”

Flip Out Wandsworth, the first London site, was opened last year and the East Ham branch will be the 11th across the country.