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The tunnel sloped down very gently. Looking up, I noticed that the ceiling above our heads was always different. Sometimes the arches were tall and graceful, sometimes they were semicircular and low and walking was difficult. Other times the tunnel became very small and we had to crawl on our hands and knees. At six o’clock we stopped for the night and I checked the instruments. [...]

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    • Inglés
  • Formato:

    Interactivo

Recurso educativo

Tipo de recurso

  • Interactivo
  • Teoría

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