Krubera Voronya the deepest vertical cave

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Krubera (Voronya) the deepest vertical cave. Krubera Cave (Abkhaz: Ӡоу Аҳаҧы, Georgian: კრუბერის გამოქვაბული or კრუბერის ღრმული, romanized: k'ruberis gamokva...

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