As has already been said, it's been dubbed a "bunker" but in reality looks more like a furnished basement.
Dissecting it scene by scene is not a bad idea as when scrutinized it is full of contradictions things that just don't make sense or add up.
Of course with cults like WT no context is provided so the viewer is left to their own fevered imaginings to consider how the situation outside the basement developed and what the final outcome is for the basement dwellers.
How long have they been there?
Why are they being raided ?
What happens to them? Prison? Execution? Bible burnings?
WT leaves these videos vague and ambiguous for a reason - to generate fear.