ナショナルジオグラフィックのインスタグラム(natgeo) - 2月17日 14時41分

Photo by @shonephoto (Robbie Shone) - Another great day underground in Devils Hole #2, Nevada supporting American cave diver Brian Kakuk dive to 95m (310ft) to collect water samples for scientists from the Universities of Innsbruck and Minnesota. This was the first time a dive had taken place in this cave for many years due to the strict control on access. The scientists are testing the chemistry of the water column at different depths.

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