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/diy/ - Do It Yourself

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>> No.1658331 [View]
File: 56 KB, 630x472, image.jpg [View same] [iqdb] [saucenao] [google]
1658331

>>1657932
>Tunnels as a form of travel, with the exception of by/under pass are pretty dumb.

???!!!??, pic related

So we've established that building a safe tunnel is something tricky and requires knowledge and skill. Instead of just shitting on the OP more, anyone want to post information or resources that would help someone acquire that knowledge and skill?

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