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Q&A How would mountains and hills have to be made-up in order to impede tunneling them WHILE still allowing them to be mined out?

In my con-world I went lengths to introduce a plausible lighter-than-air element and did rather large amounts of thinking about landmasses in order to promote the development of airship technology ...

3 answers  ·  posted 8y ago by dot_Sp0T‭  ·  last activity 6y ago by dot_Sp0T‭