To organise the transport of all the equipment must have been a mammoth task but the reward of actually being in those galleries and halls would have made it worth while. I also admire tremendously anyone who wants to explore deep underground. We, those of us who would take one look at the first descent and back away!, owe a debt of gratitude to those who continue because of the knowledge we gain from their work.
As a natural--born sceptic, I dismiss the idea of a room full of metal, but that was such a minor part of the article that that is irrelevant! The information about the geology, the waterfall, the flora and fauna is so interesting and absorbing.