Your opinion about this images

[Vox veritas]

Hi. I need your opinion about this images. They are near a tunnel with 16 meters deep. Surely belongs to the Jesuit. Any suggestion about the possible meaning? Thank you. VV

 

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[ilyes1113]

hello .i think that old marks in spain resseble at marks in algeria .
if theris other signes in the tunel any mark like x or 0 .or one of those pics