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.

教授的计算非常正确。我们已经到达了六千英尺的深度，超出了人类迄今为止所能到达的深度，例如蒂罗尔州基茨巴尔的矿井和波希米亚符腾堡的矿井。