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If you want the Hidden Vally Bunker Key, you need to pickpocket one of the Members of the brotherhood of steel
The Brotherhood of Steel is a fictional faction in the Fallout video game series. They are typically located in various regions across the post-apocalyptic wasteland, each chapter with its own base of operations. Their presence can vary depending on the specific game and storyline.
You go to their bunker and talk to the leader. either follow through his missions or help the other guy. then do the second mission and then they will accept you. Also note you have to do the 'independant' or 'NCR' main story paths because the other two will demand you wipe the Brotherhood out with no way to negotiate a peaceful resolution. Also if the Brotherhood's original leader is replaced, the replacement will refuse a peace treaty with the NCR too, meaning again the only choice is to destroy them.
you have to complete all the missions for the brother hood of steel and they will give you the key.
You must hire Arcade Gannon as a companion. You can find Arcade with The Followers area inside Freeside.
Because you said "idolized" I'm assuming that you mean Fallout: New Vegas. If you get into the underground bunker of their's in hidden valley (can be done different ways), you should ask around. Talk to a few people and I'm sure you can find something to do for them that will make them like you and the more you do, the bigger assignments they give you, the more caps and the more they like you :)
You have to find the password to the terminal left behind by the Keller family. There is a great guide on gamefaqs that describes the process in detail. http://www.gamefaqs.com/ps3/939932-fallout-3/faqs/55585
The bunker buster bomb is a very large bomb that either blows up the bunker by exploding directly on top of it (if the bunker is at ground level), Or if the bunker is a few feet below ground, the bomb will go through the dirt and explode in the general area of the bunker and destroy it. The bunker bombs of today, that are dropped by the F-15E Eagle, are much more powerful than the bunker buster bombs that were dropped in WWII by the English Avro Lancaster bomber.
You willing give them Ed-E to upgrade and whatshisface tells you to come back in around 3 days if I am right. So I reccomend leaving the vacinity of the BoS bunker and waiting in goodsprings for three days. Go back to whatshisface and he should have Ed-E ready for you. If not, then you may need to wait longer, or you game encountered and irreversable bug.
Thay destroyed it because they didn't want the evil place to become a shrine.
Go under a bunker and pray for safety? Common sense.
Benedict Arnold died. Benedict Arnold died.