A trampoline? Now that's an idea for getting into one of those tunnels in Cwmorthin which is out of reach half way up a wall :oops:
They seemed to have several layers of nets across the width of the cavern (and obviously ones at the side to stop you trying to bounce off the walls!) and there was some sort of net tunnel to go down to another level.
The name appears to be 'Bounce Below' from a couple of Tweets I found.
Does not show well but picture here
pic.twitter.com/YgY6KBgNWL
Opens in July according to a Tweet from Helen Skelton
Martin Briscoe
Fort William