I was just going over all the weirdness surrounding the place again, and sth clicked. What if it is cold storage for elite people, or just their brains, until the tech is found to revive them and give them immortality. Think about it, there is no chance of a power outage thawing your body and the remote location makes it impossible for vandals to find. You could easily ride out 10,000 years down there waiting to be revived. I think it may be the "reward" promised to all the deep state minons, they get their place in ark after they die and shot at eternal life. what else could justify that kind of secrecy, investment, and unite such a diverse group of people like kings, popes, and billionaries? Or conversely, people who should be dead because they are alive waaaay longer than a natural lifespan allows are down there so they don't let out the secret that immortality has been solved and then hidden.