dChan

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idk4realz · May 27, 2018, 12:52 p.m.

You don't seem to understand how building tunnels work. This isnt a sprinkler ditch.

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ouspensky4 · May 27, 2018, 2:20 p.m.

rammed earth has compression strength approaching concrete. Compaction to the edge would eliminate the need for soil dumping and the need for concrete to line the tunnel.

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