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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: "But," inquired Jack, "have you any possible clew to guide your search?"
"Perhaps I have. Listen to me! Five miles west of New Aberfoyle,
under the solid rock which supports Ben Lomond, there exists a
natural shaft which descends perpendicularly into the vein beneath.
A week ago I went to ascertain the depth of this shaft.
While sounding it, and bending over the opening as my plumb-line
went down, it seemed to me that the air within was agitated,
as though beaten by huge wings."
"Some bird must have got lost among the lower galleries," replied Jack.
"But that is not all, Jack. This very morning I went back
to the place, and, listening attentively, I thought I could
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