Just trying to wrap my head around Sigma Base's role. I am assuming it is C3I, as there just does not seem to be any manufacturing capability other than for food and base maintenance.
If these assumptions hold, then I think the base looks pretty complete. The only thing that was not clear is the scale of the base. Boring tunnels will generate a significant amount of slurry that has to be moved off site. The longer the tunnels, then more slurry needs to be taken away. This might make keeping it secret harder, especially if samples of the slurry need to be tested prior to disposal.
If the tunnels were blasted instead, then a similar problem with the tailings.
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