Hmmmmm
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Hmmmmm
I believe the DUMBs are constructed in the layer where there are a lot of natural voids/caves so there doesn't have to be a lot of excavating. If memory serves, they are 10km down or in that range.
I can almost guarantee that during the exploration process the government has some sort of say if a certain plot of land is near one of their DUMBs. 10km is a few miles (~5km) deeper than the verticle of a drilled-out well.