ナショナルジオグラフィックのインスタグラム(natgeo) - 5月16日 13時55分

Photo by @shonephoto (Robbie Shone) - Where no light exits, traversing through a cave can often be a bit of a challenge. That’s why cave explorers try to make it as simple and straightforward as possible so that they can spend as much time carrying out the scientific studies and mapping the newly discovered world. This photograph shows a team of cave explorers and scientists negotiating a cave beneath the Hintertux glacier in Austria called Spannagelhöhle.

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