The railway track is going up to an ancient quarry entrance, along the slope.

A very steep slope that leads to the exploitation level of the underground quarry. Here the picture is taken at mid-height of the slope.

Fish bones (also abbreviated ADP) are part of a network of much larger gallery, called Fantasques, due to the name of a road, above the galleries. As its name suggests, the network looks vaguely to a structure of a wheat. In fact, it is a network of parallels arranged around two dorsals (or main roads) with an orthonormal structure, much like certain Nazca archaeological symbols, or even a TV antenna, but definitively not like fish bones.
The main feature of these undergrounds is their purpose was not to drain water, unlike the other two parts of the network (The Colinettes and large galleries). Most galleries are straight, flat, millstone, with dry soil, with the notable exception of the main corridors, steep slope with many stairs.

Extraction of the Stone follows the geological slope. At the bottom of the galleries, a flat corridor allows to evacuate materials by truck. On the right, a horizontal corridor connects two superimposed levels.

A very steep slope of the sewer to another level.

"The mine"

The slope goes down in the lower level that can make the connection with the largest sectors. Warning, the quarry and especially this level is full of holes in all kind. So please pay attention, thank you.

On the slope, toward the gold mass.