A huge network of inspection galleries for the ancient quarries of limestone located on the left side ... more than 300 Kilometres of galleries only for paris... and probably the double in the south suburb extention. Of a malleable nature, it was the subject of numerous non-official adjustings during the second part of the 80's. It remains lowly frequented today by a much more quiet population.

The south suburb extention of the last mentioned network can be distinguished by its "headroom 5 feet" galleries, by a greater number of levels and by a much more chaotic topography. So there can be found there totally wild and unexplored places.

Of all the "ancient" underground networks, quarries are generally the vastest and the most interesting... especially when they are right under the city.

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