Ce livre est un ré cit dé taillé d'un voyage dans une cé lè bre grotte en Belgique au dé but du XIXe siè cle. Les auteurs dé crivent les merveilleuses formations rocheuses et les paysages souterrains fascinants qu'ils ont dé couverts, ainsi que les dé fis logistiques qu'ils ont rencontré s lors de leur expé dition. Cette relation est un té moignage important de l'histoire de la spé lé ologie.
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