British and Vietnamese spelunkers have finished a ten-day exploration of the Son Doong Cave, called the world’s largest grotto.
The 20-member exploration team joined explorers from the British Cave Research Association (BCRA) and the Hanoi University for Natural Sciences. The explorers penetrated an additional 530 meters into the Quang Binh province cave, increasing the part that has been surveyed to 7.2 kilometers. They confirmed that Son Doong has two entrances, unlike the mammoth karst caves in Phong Nha-Ke Bang National Park (Quang Binh).
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