hello, i had an idea wheather it could be possible to build a tunnel through the core of our planet from surface to surface. maybe its silly but maybe this topic would provoke you to think a bit over this even if its impossible
so the biggest problem is that what would withstand 6000°C and 350GPa pressure, the cooling of the tunnel, the tectonic movements and the mass flow in the inner of our planet...
the best refractory material i know is Ta4HfC5 with melting point 4215°C(and i think it raises with raising pressure), the strongest pressure withstanding material is probably carbon fibre(i dont know how thick should be the wall of the tunnel from carbon fibre at given internal diameter - if someone knows statics please calculate it)
cooling could be done in cascade, the central part of it could be cooled with some boiling metal, for example iron, at higher levels the condensing metal or any other material would heat up the next stage cooling medium, and this will cool also the wall of the tunnel, etc..., the cooling medium would be placed between an outer
frame tube and inner tube which will be the transportation shaft...
so before i am going to think about it further i need to have positive answer about the statics of the outer frame bearing the pressure
dont think if there is enuogh tantallum and hafnium on the earth for this, just think if it is possible anyhow with mankinds nowadays knowledge...
thank you for answers my mad friends![]()