As a caver (and novice mine explorer) this makes me so happy. I love secret tunnels so much, and its fascinating to know these places exist and that I can visit them if I ever go on holiday to Switzerland! Take this as a general 'thank you' from the UK caving community - lots of info can only be passed on through word-of-mouth, outdated maps or vague instructions - photos and videos of these places are basically priceless to us because its the best info you can get without going yourself (which is hard to do if you have no info, and so on...)