ナショナルジオグラフィックのインスタグラム(natgeo) - 4月19日 15時13分

Photo by @shonephoto (Robbie Shone) - On a journey into the unknown. Deep underground and a long way from daylight, an explorer wanders down a sandy ramp through a giant fossil passage in Clearwater cave in Gunung Mulu National Park, Sarawak. Although this cave is the 8th longest in the world, it is believed to be the largest interconnected cave system in the world by volume. Beneath the surface of our planet lies a world that is yet to be fully explored. You never know what is round the next corner. #natgeoearthday

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