What country has the deepest hole?

I'm curious, what country can boast of having the deepest hole in the world? Is it a geological marvel, perhaps the result of natural forces that have eroded and shaped the land over millions of years? Or could it be a human-made achievement, like a mining excavation that has reached unprecedented depths? Either way, I'm fascinated to know more about this mysterious hole and the country that houses it. Could you shed some light on this matter? I'm eager to hear your thoughts and any insights you might have.