ナショナルジオグラフィックさんのインスタグラム写真 - (ナショナルジオグラフィックInstagram)「Photo by Robbie Shone @shonephoto | American speleologist and cave explorer Erin Lynch peers over her shoulder and down into the giant void of Cloud Ladder Hall. The fog gathers and remains trapped on the roof of this giant room, and although the floor is out of view and can't be seen because of the cloud, her echo reminds her that it is over 300m (1000ft) below. This really is a very lofty location to be suspended from a single rope.」6月17日 5時37分