Prefacing information // The Creed of Forgemasters, a religious society worshipping what thry identify as the purity of machines and driven by the holy mission of liberating the pure, immortal souls of humankind from their corrupted mortal shells, exists primarily in the industrial centers of the world. It controls various proxy corporations across the globe, which operate various industrial facilities of completely ordinary and inconsiderable profit and production. The upper management of these facilities is entirely composed of hidden the members of the Creed, undetectable as non-organic to the outside world.
Deep below, though, are massive, sprawling complexes of extremely advanced technological advancements. All who reside there - who can number well into the thousands at the largest complexes - are transplanted into a completely synthetic body, not only physically preforming as well as the organic counterparts, but even better, while usually maintaining the appearance of a human form - or at least the option to take it.
Each Forge Complex is overseen by a Forgemaster - an incredibly powerful machine intelligence, in some cases even given a physical form, who administrates all of the functions of both the Forge itself, and instructing the managers in the front above.
My question is specifically how they can feasably hide the construction of these massive complexes. With the construction, the mass quantities of earth being excavated has to be removed without raising suspicion from anyone, including those who work in the factory above that are not yet initiated into the cult, and then all of the materials being brought in, many of which are eras ahead of the current level of technological advancement. All of these materials will be sourced from other forges, which also raises the question of how they are able to take the materials from their respective forges and able to transport them, possibly internationally, again without raising suspicion.
The majority of my concerns are logistical, but I also have concerns with the legal aspects. As far as I know, most countries inspect international cargo to some capacity, and the construction of underground levels of a structure requires approval, as well as regular inspections. If this is to remain completely secret, that only makes it harder, considering the afformentioned logistical concerns; removed earth, sudden import of building materials, etcetera.
Any more information needed will be provided if asked for! I really appreciate any effort to help out ^^