Space shuttles would have similar challenge (actually in reverse) - how to protect sealed air inside a closed cylinder from almost absolute vacuum outside in an environment where heat and cold are extreme; the cylinder being fabricated from overlapping conjoined pieces.
Thanks for sharing. They seem to be convinced about the viability albeit concluding that it may need bigger diameter pipes and the speed would be little slower.
No alarms on thermal expansion, structural integrity etc.
Space shuttles would have similar challenge (actually in reverse) - how to protect sealed air inside a closed cylinder from almost absolute vacuum outside in an environment where heat and cold are extreme; the cylinder being fabricated from overlapping conjoined pieces.