The description given was simply "bunker". This could mean a variety of things for a variety of purposes. It isn't too unreasonable to think that a short term facility meant as a staging ground for a near immediate military operation would have the soldiers packed in like sardines for a week.
That said, the practicality of building a facility even the size of a stadium in a foreign, hostile state, without anybody finding out? Not to mention moving 50,000 people to this facility during a global pandemic with the most severe travel restrictions in remembered history imposed? The idea that people who don't have schizophrenia can believe this blows my mind.
