Quote:
Originally posted by PSK480
it's actually quite simple. You have to trench out to build a wall anyway, for the foundation. You just trench down as high as you want the wall to be, probably a little higher, and you start building the wall, giving room for the persons to work on the wall. Then you fill in the work area and cover over the wall and you have an underground wall.
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Alright, so then what would the purpose of an underground wall be?