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Hang Son Doong in Vietnam is widely considered to be the largest cave in the world - and it was only explored for the first time in 2009

United kingdomRepublic ofJohn spiersUrs zihlmannHoward limbertBritish vietnam caving expedition teamBritish vietnam expedition team to son doongHang son doonHang son doongBritish vietnam expedition teamSon doongLonely planet