Tunnel blasting shockwave.
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Previously:
https://www.homemadetools.net/forum/...892#post152638
https://www.homemadetools.net/forum/...643#post118142
https://www.homemadetools.net/forum/...932#post164202
https://www.homemadetools.net/forum/...387#post146579
https://www.homemadetools.net/forum/...341#post135208