ナショナルジオグラフィックのインスタグラム(natgeo) - 10月21日 21時05分

Photo of Lake Cadoux underground in France by @shonephoto (Robbie Shone) // In May 1953 when Edmund Hillary and Tenzing Norgay reached the roof of the world for the first time and stood on top of Mount Everest, a small team of french explorers lead by Fernand Petzl had discovered the then deepest cave in the world to a record depth of -1122m (3680ft) . To this day, the Gouffre Berger in the Vercors still stands as one of the most popular caves in the world and is frequently visited by adventure cavers with hopes of reaching the bottom within a 10-day permit.
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