| Front | Surat kabar El Pais mengatakan, beberapa dari gua-gua itu adalah terowongan yang digali pada abad 19 untuk mencari air dan seringkali dipenuhi oleh gas vulkanik. |
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| Back | Newspaper El Pais said some were tunnels excavated in the 19th century in the search for water and that they were often filled with volcanic gases. |
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