In a secret Paris cavern, the real underground cinema

Hmmm very interesting, a strange underground cinema. A weird collection of movies and a bar. What have the catacombs of paris been hiding?? Supposedly this kind of thing is not that uncommon. Get a bunch of drunken frenchmen together and they'll start digging, would appear to be the take home message. What I don't get is if this wasn't really a secret society why go to all the trouble of building it underground. Anyway its an interesting article.