All you have to do is to followDoctor Li.
Eventually you’ll get to a gate which leads toCitadel - courtyard.
Travel to that location.
Once you’re inside theCitadel, listen to a conversation betweenDoctor LiandElder Lyons.
Talk toLiandLyonswhen you have the chance.Liwill order you to findScribe Rothchildin order to gain access to the archives.
to get to findRothchildyou must travel toCitadel - lab.
you could access this area from thecourtyardor from theA ring.
It shouldn’t take too long for you to findRothchild(screen).
Proceed toCitadel - A ring.
you’ve got the option to find the Vault-Tec computer in the southern area of theA ring.
Locate a working station and use it to gain access to the system.
ChooseVault 87and display the list of equipment for thisvault.
You should notice thatG.E.C.K.among other things.
You may go back toScribe Rothchild, so this means you’ll have to go toCitadel - labagain.
AskRothchildto show you whereVault 87is located.
Approach a large map (screen) and notice severalvaulticons.
The same locations will be added to your Pip-Boy.
He will warn you that it’s not going to be easy to get toVault 87.
You must return toCapitol Wastelandand this means you’ll have to exit theCitadel.
Rothchildhas suggested that you should visit a town calledLittle Lamplightwhich is located to the south-east ofVault 87.
Obviously you should follow his advice.
Once you’ve arrived atLittle Lamplightignore the buildings located on the surface.
Proceed to a small entrance near the rocks (screen).
It leads toLittle Lamplight - caverns.
Try moving forward and after a short walk you are going to be stoppedby Mayor MacCready.
He’s in charge of this town populated entirely bychildren.
Otherwise you will have to do him a little favor.MacCreadywill mention that a fewkidshave been kidnapped by theslavers.

You must rescue them.
Read the description forRescue from paradisequest if you want to find out how to do this.
Once you’ve gained access to theLittle Lamplight, you should talk toMayor MacCready.
Ask him to reactivate one of the security terminals.
Find the doorMacCreadywas talking about (screen) and you should be able to locate the terminal nearby.
If your science skill is high enough, you will be allowed to hack into the system.
This will allow you to gain access to the security system of thevault.
ChooseOpen doorfunction from the menu and travel to theReactor room.
You will find yourself standing insideVault 87and this quest will come to an end.
It would be a good idea to askMacCreadyto show you the way to the entrance toMurder Pass.
It’s located in the northern section of the caves.
Once you’ve arrived wait for him and thePrincessto open a large gate for you.
Proceed to a new door and confirm that you want to travel toMurder Pass.
Get ready, because these caves are being occupied by a lot ofsupermutants.
Avoid larger rooms and instead choose smaller passageways.
Keep heading north until you’ve reached an entrance to the vault (screen).
fire up the door.
Watch out for a pressure plate to your right, because it’s a trap.
Move to the north and find the entrance to theReactor room.
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