Blasting a pipe trench.
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Previously:
https://www.homemadetools.net/forum/...898#post226491
https://www.homemadetools.net/forum/...824#post100116
https://www.homemadetools.net/forum/...452#post200641
https://www.homemadetools.net/forum/...891#post194536
https://www.homemadetools.net/forum/...347#post169486