I have a youtube video coming up which will explain part of how this will work.

.gov people are talking about "a contraction" in government services, and a lot of these camps are going to be set up for voluntary check-in when various civil entitlement programs get cut way back. The government is going to be unable to sustain the poor at current levels, and may even be unable to sustain a lot of government workers at current pay levels also. What they plan on doing is basically a large scale survival type thing which has actually been done before during the 1930s with the "Hoovervilles" to some degree. Large 100% government run "towns" originally set up as economic refugee camps, then people get graded through and selected out to go to newly constructed "cities" that would have a higher standard of living due to having a pre-selected population.

Part of the voluntary check-in means for most people, checking in without weapons, and even armed professionals would be unlikely to be encouraged to keep weapons other than their duty weapons.

My personal opinion, if there is something really big coming up and this whole deep underground city "continuity of government" thing is actually a real plan, then part of it involves a system of recruiting lots of lower level workers who would be more or less willing to work productively at a subsistence reward level.

Reason being, if you put all the high power people in those high cost big underground city bunkers and such, well, not to many of them are going to want to go from being military officer and town mayor to pot scrubber. Someone probably came up with the idea of using prison labor for the lower end work, until someone pointed out how unruly and rebellious the prisoners could get if not constantly watched and supervised by an armed force which would also be capable of taking over the "upper class" people too.

The only other way that works without a large and potentially hostile armed guard force is some way of recruiting the necessary labor from a labor pool that for whatever reasons, is proven capable but cheap. My opinion, they would be recruited from some sort of transition camp where human resource people would be sifting through them fairly carefully before they go to any sort of secret facility.

What would remain at the camp once SHTF is not of much concern to the elites once they got the "cream of the crop" recruited into the bunkers, the bunkers sufficiently supplied and the doors locked from the inside until whatever big thing blows over (2012 climate change, big collapse, alien invasion ect ect).