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.
Los cálculos del profesor eran exactos; habíamos ya rebasado en 6.000 pies las mayores profundidades alcanzadas por el hombre, tales como las minas de Kitz-Babl, en el Tirol, y las de Wuttemherg, en Bohemia.