A Journey to the Interior of the Earth

"By my observation we are at 10,000 feet below the level of the sea."
"Is that possible?"
"Yes, or figures are of no use."
The Professor's calculations were quite correct. We had already attained a depth of six
thousand feet beyond that hitherto reached by the foot of man, such as the mines of Kitz
Bahl in Tyrol, and those of Wuttembourg in Bohemia.
The temperature, which ought to have been 81 deg. (178 deg. Fahr.) was scarcely 15 deg.
(59 deg. Fahr.). Here was cause for reflection.