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That is one of the things that really bugged me about the most recent sequel.

Minor inconsequential spoilers

..

The research facility has geothermal heating which stretches for miles and an enormous underground tunnel system. How did they build all this?

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Indulging the notion that money is no object; perhaps a mix of

* using pre existing lava tubes, and

* hiring the engineering teams that tunneled under Sydney harbor and elsewhere for rail expansion, the teams that did the London sewer and new London rail tunnels, and

* not hiring The Boring Company.

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