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Giant cave hall discovered down sinkhole

<p>Chinese and British climbers have found a cave hall at the bottom of a 200-metre long sinkhole in Guangxi, China, state TV says.&nbsp;</p><p>The large cave hall is estimated to be 6.7 million cubic metres. </p><p>The team lowered themselves into the sinkhole using a single rope. It is hoped the discovery will help geologists to understand the region better.</p><p></p>
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