I'm not sure the diggers will need some of the infrastructure they usually do. The spoils can be mechanically handled by conveyor belts. Prewar pits could have been dug for all the spoils and they are just dumped the debris in them. So instead of a Conga Line of dump trucks going to a site miles away they just run the belt from the digger to the pit. The cranes and everything could be in the caverns. Heavy lifting gear isn't a bad thing to have on hand for a lot of reasons, so it isn't unlikely that they have that already.
I don't agree with the cut and cover construction method. It is way too public.
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