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China's high-speed rail network now stretches more than 50,000 kilometres across the country — longer than the combined high-speed rail networks of every other nation on Earth put together — and the entire system was built in roughly 17 years, beginning with a single line opened for the 2008 Beijing Olympics, and now connects 33 of the country's 34 provincial-level divisions with trains running at routine commercial speeds of 350 kilometres per hour

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In the limestone mountains of the Black Sea coast, deep beneath a single mountain range in the Caucasus, sits a vertical chasm called Veryovkina that plunges 2,212 metres into the Earth — roughly seven times the height of the Eiffel Tower straight down — and reaching its bottom requires a four-day descent through near-freezing waterfalls, vertical shafts, and absolute darkness so complete that explorers report their brains begin hallucinating light in the deepest chambers.

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