To be considered in the countryside number of underground facilities known a « muches » (hide-out) the earliest of them dating back to the second half of the XVIth century and the first half of the XVIIth century, as confirmed by written sources, graffiti ans archaeological data. They were rationally created in an original style : long tunnels with branching-off corridors, lined with rooms with varied fittings. They witness both the courage and adaptability of local people repeatedly to the looking and other exactions of belligerents groups roaming the country. Reinstating their usefulness into the historical context of the past brings to light and hitherto little-khown aspect of rural life.