The deepest cave in the world is now 2'400 m deep and it takes 3 days to get to the bottom. https://www.bbc.com/reel/video/p07p40y7/the-daring-journey-inside-the-world-s-deepest-cave #speleo
@kravietz hehe never thought of it that way!
You go much deeper your going to discover middle earth!
@Wetrix Unfortunately yes - Soviets drilled 12 km and yet found nothing :) https://en.wikipedia.org/wiki/Kola_Superdeep_Borehole
@Wetrix Neither me. Even though I'm quite experienced caver, it's like bloody Mt Everest, just the other way around!