Interestingly, the excavation periods of this shaft show a discrepancy, as if it wasn't dug in the same era—the deeper you go, the older it seems.
Judging by traces at several depths, this shaft was once intentionally sealed off with various types of 'lids.'
The later explorers removed the main parts of these lids, leaving behind remnants around the edges and continued digging deeper.
I haven't systematically studied human history, only knowing that two countries competed in digging into the Earth in the last century.
The deepest reached over twelve thousand meters, taking more than twenty years, before the plan was halted.
But what lies in the Earth Core, no one has seen with their own eyes. It's said that the temperature of the area surrounding the core is close to six thousand degrees Celsius.
