It's really fun to think about though, including what it would take to create an actively cooled passageway through the core of the earth. This would be insane engineering, and it would enable antipodal trips that require almost no energy.
It's really fun to think about though, including what it would take to create an actively cooled passageway through the core of the earth. This would be insane engineering, and it would enable antipodal trips that require almost no energy.