Depth of the deepest cave in the world, Krubera (Voronya) Cave in the Arabika Massif, Western Caucasus, became 6 m greater, as established by a dive of the Ukrainian caver Gennady Samokhin in the terminal sifon in the cave's Main Branch on August 10th. ...
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The depth of the reference survey station near the water table of the terminal sifon is 2145 m. During the Ukrainian Speleological Association expedition in 2009, Gennady Samokhin reached depth of 46 m in the sifon, which established the world cave depth record at -2191 m. Now he has reached the point at six meters deeper than in the previous attempt, at the total depth of 2197 m.
I would think twice about walking 2197 m, let alone descending a cave with that depth