The aperture, which was almost round, was about five feet in diameter; the dark passage was cut out in the live rock and lined with a coat of the eruptive matter which formerly issued from it; the interior was level with the ground outside, so that we were able to enter without difficulty.
La abertura, que era casi circular, tenía un diámetro de cinco pies aproximadamente; el obscuro túnel estaba abierto en la roca viva y cuidadosamente barnizado por las materias eruptivas a las cuales dio paso en otra época su parte inferior se encontraba al nivel del suelo, de tal suerte que podía penetrarse en él sin dificultad alguna.