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Pechengsky District 2024 Scientists dug biggest hole ever and discovered 'sound of hell' indy100
Kola Borehole: Mystery behind the deepest-ever man-made hole The Statesman
Border land: Maria Gruzdeva's travels on the edge of Russia – in pictures The Guardian
Inside Russia’s 7.5-MILE deep hole branded ‘Well to Hell’ – covered by a rusty lid... The US Sun