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Souterrains, le monde creusé par l'homme. Jérôme et Laurent Triolet. Carrières souterraines, champignonnières, villes souterraines, souterrains-refuges, habitats troglodytiques, tunelles de guerre, souterrains cultuels, catacombes.

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Access defence
 

 

 

The loophole that is controlled from this guardroom opens onto the access gallery exactly in front of a door; Petosse underground-refuge (region of La Roche-sur-Yon, France).

 

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Reference : 1153N045

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