When you enter a quartzite cave, you have to completely forget what you know about caves -- classic limestone caves or the touristic caves that you can visit in several places in the world.
珪岩洞窟に入る時は 今までの知識は 全て忘れてください おなじみ鍾乳洞や 世界各地にある 観光用の洞窟とは違います