Ключевые слова: asia, borneo, cave, cavein, cavern, caving, dark, daylight, earth, entrance, environment, erosion, exit, exotic, exploration, explore, exploring, forest, formation, geologic, geology, gunung, hole, inside, interior, jungle, karst, landscape, light, limestone, malaysia, mulu, national, natural, nature, old, opening, outside, park, plants, rainforest, rock, roof, stone, sunlight, tropical, underground, view,