That's pretty advanced stuff, and I would recommend just forgetting about it because you won't be able to use your map much longer anyways. However, if you really want to try this, I would suggest using negative lights inside the bunker (with or without ME). But for the sound problem, you'd probably need to use a zone or trigger, I'm not positive on that one. Look in other maps to find such scripts, unless you already know how to script for BL maps.