4 ms·

Things are easier when you get to destroy thousands of peoples homes and just dig a trench to put your tunnel in.

• jimnotgym 4y ago
  I'm sure there were plenty of engineering challenges in building the first!
  • bombcar 4y ago
    But most of them could be solved buy "digger bigger hole!"
• stevage 4y ago
  And don't have to worry about skyscrapers, optic fibre cables, etc etc.