Probing a series of “windows” in the walls of the deepest part of the cave, the team was blocked time and again by sumps or impossibly tight squeezes. But finally, on October 19, Kasjan ...

Related: Deepest blue hole in the world discovered ... The underwater portion of the cave is an irregular, vertical cylinder ...

Krubera Cave in the republic of Georgia is currently the deepest known cave ... tectonic forces thrust ancient beds of limestone into vertical walls of rock. Igor was a 24-year-old junior member ...

The deepest cave - the range from the highest point in the cave to the lowest - is 317m. The deepest vertical drop for cavers to abseil down is 97m. The calcite formation in many caves in the ...

A US citizen trapped in Turkey's third deepest cave for more than a week has been pulled to safety, rescuers say. More than 150 people were involved in efforts to save caver Mark Dickey after he ...