Thai cave hero divers explore Vietnam tunnel that could be part of world’s biggest cave system

Three divers who helped rescue a Thai soccer team last year have made a fresh discovery in Vietnam, where they explored a tunnel that could expand the footprint of the world’s largest cave.The team was invited to descend into a waterlogged pit in the Son Doong cave in central Vietnam that has never been explored and is believed to connect to nearby chambers.They were forced back at 77 metres (252 feet) because they did not have enough oxygen to push further, but they think the tunnels could be…

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