We had a big discussion about a few new things we're implimenting tomorrow, and most of it centred around how lore accurate we can make it.  While I can't comment directly as to the purposes or intents of the dev team, I just want you to realise how in-depth we actually go to research these things.   We spent hours today talking, googling, watching videos, to finally come to this one conclusive statement in our dev chatroom:

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<[FSDev]Bandu> you got that 'banging; generator sound for the bunker?
<[FS]Ulversial> not sure what that is bandu. in the movie scene?
<[FSDev]Bandu> ya .... the generators make a kind of banging sound ... bit like a train in some ways
<[FSDev]Preacher> thats cos there are officers humpin gin the background on there break
<[FSDev]Preacher> up against teh generators
<[FSDev]Bandu> you and your SW porrn
<Woodrow> hey, it's lore!
<[FS]Ulversial> yup
<Woodrow> and we need to keep things lore accurate!