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Urban Area E&E
Another option for urban area E&E could be large diameter storm drain systems underneath roads in large cities. I think the trick would be in pre-planning route to ensure accessibility and making sure you have options for "opening paths". 
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"Greater love hath no man than this, that a man lay down his life for his friends", John 15:1.
“He should have armed himself if he’s gonna decorate his saloon with my friend”, Clint Eastwood, The Unforgiven.
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