It is just a short distance to the west of Old Olny, the door is below a rock outcrop, if you find an old barn you have walked passed it. If you've not found Old Olny then look for it to the East of Clifftop Shacks, or north east of Greener Pastures Disposal site.
vault 112 is a dream machine basically you go in and sit down in this chair and you lay back and zip black and white coloring and you are in a made up reality by this guy but he portrays himself as a little girl in the dream you will see but not to spoil it but your dad is the dog in that little playground you will find the girl and the dog
When you go to the Pentagon after some very unfortunate events at the Jefferson Memorial, you'll talk to one of the scribes who can help you find the location of Vault 89. When you talk to The Scribe and see the projection with Vault 89 you will see the location of all the other vaults and they should be put on the World Map part of your Pip-Boy. If they aren't then you at least have a rough idea of where they'll be.
Vault 77 is not a location in Fallout 3. The only reference to Vault 77 in Fallout 3 is the Vault 77 jumpsuit and an associated holodisk both found together on a shelf in the raider barracks at Paradise Falls.
There are 7 vaults as follows:
Vault 87
Vault 92
Vault 101
Vault 106
Vault 108
and Vault 112
There is no vault 77. but there is a vault 77 suit. it is located in paradice falls next to a holotape. the holotape has a slaver saying it is haunted and wants to burn it because it is the suit of the puppet master that was in the vault with only a crate of puppets for company.
if you want to enter it you may have to start the quest agathas song which you start in agatha's house, in case you haven't found it it is located east but slightly north of meresti trainyard. i don't know why its not but if your talking about vault 87 then you have to enter it through little lamplight, engage in dialogue with mayor mccready about vault 87 and he should open up the gate that leads into murder pass, which eventually leads to vault 87.
You have to go through littlelamp light to get into the vault, talk to the kid at the gate after you get in he will lead you there (at lest to a door) best of luck.
Near Little Lamplight Caverns.
SPOILER: no he is in vault 112 in smith Casey garage
Vault 112 is in Casey smiths garage once you activate the electrical switch and you will have the doors into the basement open and then you get into Vault 112 and are spoken to by a robo-brain or whatever, and you go into the machine after you change into the Vault 112 vault suit.
There are 7 vaults as follows: Vault 87 Vault 92 Vault 101 Vault 106 Vault 108 and Vault 112
Yes, if you follow the main storyline you will finally meet him in vault 112.
There are no enimies inside the vault itself but there are a few mole rats in Smith Casey's garage, which you have to go through to get to vault 112
There is many hidden quests in Fallout 3 but i there is one when you reenter the vault. (after you father dies) hang around the vault entrance.
vault 77 doesn't exist in the game.
Just North from Vault 101.
All Vault Tech Vaults in Fallout 3 where made public. You are talking about private shelters that are scattered throughout the Capitol Wasteland.
south-east of vault 92
Yes. Seven vaults exist in Fallout 3. One of them is Vault 101, where your character begins the game. For spoilers as to who or what lives within the remaining vaults, check http://fallout.wikia.com/wiki/Vault .
In Fallout 3 vault 101 is the only Vault still active, every single other vault the people went crazy and then they killed eachother, simply because they wanted to leave the vault so bad because they were trapped in there