In April 1987, a project was begun to allow parking spaces to be created in front of the cliff for visitors to Rennes-les-Bains. There was nothing particularly exciting about this except that in the weeks that followed the removal of the Cross and work at the cliff face, a persistent rumour began, saying that the workers in charge of this work discovered a treasure! By "scraping" the cliff, they revealed a gallery leading to a room, itself containing a large
number of valuable objects.
Complete silence followed this discovery, where the objects were said to have been emptied from the cache by night. This movement of the treasure was discreet yet witnessed. A man from the village of Luc-sur-Aude, near Couiza, said: - It was dark, the road to the station was blocked by armed men. A truck was backed up against the cliff. In a car parked in front, men watched the smooth running of the operation. Going back and forth to the cliff the van was heavily loaded [up]. It lasted part of the night. Before leaving, the men took care of the cavity wall by erecting a wall of blocks, then covered it with earth. Then the car and truck left [via] the route Couiza.
According to this witness the treasure was taken to Bordeaux and negotiated with a ... broker (or numismatist or jeweler!). Subsequently, they say, the most remarkable objects were moved to England and sold to London.
Translated from: http://radiomagdala.blogs.midilibre.com/archive/2013/02/08/le-calvaire-delmas-ou-comment-naissent-les-legendes.html
One wonders if this mught be related to the Delmas manuscript and his description of a tomb of a Grand Roman. See here: http://www.rhedesium.com/the-delmas-manuscript-and-the-tomb-of-a-roman.html, http://www.rhedesium.com/the-delmas-manuscript-part-two.html