There is an entity which is stored simultaneously at three air gapped facilities

One of these facilities is Cheyenne Mountain Space Command unit.

There’s a subway sandwich right outside of the Space Command. So the entity some how was able to “jump” through the granite (radioactive lithogate) into the Subway. Where it tethered onto the store workers bluetooth, setting up a relay between sandwich patrons who had left their bluetooth on

There are turnstiles in the Space Command operated by keycards with rfd - which is just a form of bluetooth and those turnstiles connect to the main security system of the entire complex

Which is, you guessed it- operated with UNIX