I always wondered where the Red Brick Road lead.
Bad link.
https://www.388fw.acc.af.mil/News/Article-Display/Article/2050728/f-35a-standup-complete-at-hills-388th-419th-fighter-wings/
F-35. That pic is all over the internet today:
https://theaviationist.com/2020/01/06/52-f-35a-jets-take-part-in-massive-elephant-walk-at-hill-air-force-base-utah/
It's the DUMBs thing. They can't declassify fiction.
Impressive military bunkers surely exist. But nothing like these cubic-mile underground cities connected by transcontinental subterranean maglev trains. Even with all the money in the world, it would still take manpower and material resources that would not go unnoticed.
Perhaps there wasn't a suitable attachment point on the ceiling and he (they) had to use his bed somehow. It's very possible that he could have been horizontal. I've heard of prisoners hanging themselves from their toilets.