Soil liquefaction under city street.
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Previously:
https://www.homemadetools.net/forum/...271#post221979
https://www.homemadetools.net/forum/...269#post154116
https://www.homemadetools.net/forum/...000#post144974
https://www.homemadetools.net/forum/...915#post144618
https://www.homemadetools.net/forum/...397#post131485
