Help i need the key to drainage grate in fallout new vegas?

There's man hole in fallout new vegas in a place on the map called "abandoned bos bunker." And it says "open drainage grate to brotherhood of steel bunker" and that a key is required to open it, but I don't know where that key is. Anybody know? And. If so, be as specific on the location as you can. Thanx a lot guys!Help i need the key to drainage grate in fallout new vegas?
You cant go in there with the base game you need dead money.Help i need the key to drainage grate in fallout new vegas?
I recall trying to get in here too and having the same problem. Apparently, there isn't a key to open this place, but it becomes unlocked if you get the DLC Dead Money. Your best bet, if you want into here without getting Dead Money, is to use the console command "unlock" while targeting the door. They technically shouldn't have even added this bunker if it required DLC. They should have had it appear after you bought and downloaded Dead Money. But since it is there and there is no way to get in by any normal means, I say hey--use the console command.