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Legacy Member
The reason for the scale and longevity of the Cu Chi tunnels is a combination of two local features.
Firstly, the soil is a weird, hard, sandy clay stuff that needs almost no shoring or props.
The other factor is a VERY deep water table. Nearby waterways run in the same, concrete-like soil and did not seem to cause too much trouble. There were rumours / propaganda that the VC dug right under major streams and rivers, but I would take that with a measure of salt.
The area is in a part of the world subject to monsoonal downpours in the "wet" season. As in the mining biz, flooding is up there with "cave-in" as something you don't want when you are crawling on your guts, in the dark, fifty feet below the surface.
Last edited by Bruce_in_Oz; 05-09-2016 at 06:13 PM.
Reason: typos
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05-09-2016 06:10 PM
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