Ключевые слова: abstract, adventure, ancient, cave, caver, cavern, caving, dark, darkness, deep, earth, entrance, environment, exploration, explorer, fantasy, gallery, geologic, ground, hole, huge, human, inside, light, man, mystery, natural, nature, rock, silhouette, spelaeology, speleology, spelunking, stalactite, stalagmite, tunnel, underground, water,