english: And an abyss like Krubera Voronya, which is in the Caucasus region, actually the deepest cave explored in the world, can go as far as more than 2,000 meters below the surface.
non_english: En een ravijn zoals Krubera Voronya, in de regio van de Kaukasus -- in feite de diepste verkende grot ter wereld -- kan tot ruim 2000 meter diepte doorlopen.