Underground (literally) Cinema in Paris...

It's commonly known that under the streets of Paris there are miles of tunnels, galleries and catacombs. It's also well-known that tunnel exploration is an increasingly common pastime and there are numerous groups engaged in this activity. Surprising, however, the fact that one of these groups managed to put together an undergound cinema along with bar and restaurant. According to this article in the Times the 'cataphiles' of a century ago did something similar - they staged an 'underground concert' with a 45-piece orchestra.