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.
De berekeningen des professors waren nauwkeurig; wij waren reeds zes duizend voet beneden de grootste diepten, die de mensch nog bereikt heeft, zooals de mijnen van Kitz-Bahl in Tyrol en die van Wuttemberg in Boheme.