How tunnels are dug.
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Previously:
https://www.homemadetools.net/forum/...543#post193182
https://www.homemadetools.net/forum/...ctor-gif-96041
https://www.homemadetools.net/forum/...018#post217614
https://www.homemadetools.net/forum/...321#post211587
https://www.homemadetools.net/forum/...418#post204747
