By the 7th of August our successive descents had brought us to a depth of thirty leagues; that is, that for a space of thirty leagues there were over our heads solid beds of rock, ocean, continents, and towns.
El 7 de agosto, nuestros sucesivos descensos nos habían conducido a una profundidad de treinta leguas; es decir, que teníamos sobre nuestras cabezas treinta leguas de rocas, de mares, de continentes y de ciudades.