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/diy/ - Do It Yourself

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>> No.390501 [View]
File: 45 KB, 435x291, 2-tunl.jpg [View same] [iqdb] [saucenao] [google]
390501

this tunnel pipe buried 60' underground in 1958
shows visible signs of imminent lateral compression failure. In another 50 years we will have even clearer signs for comparison.

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