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The excerpt represents the core issue or deciding factor on which you must meditate, and is drawn from The Underground City by Jules Verne: of which even the oldest miners in the county had ever known.
No! It was merely that the geological layers had left this
passage when the secondary earths were in course of formation.
Perhaps some torrent had formerly dashed through it; but now it
was as dry as if it had been cut some thousand feet lower,
through granite rocks. At the same time, the air circulated freely,
which showed that certain natural vents placed it in communication
with the exterior atmosphere.
This observation, made by the engineer, was correct, and it was
evident that the ventilation of the new mine would be easily managed.
As to the fire-damp which had lately filtered through the schist,
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