Still in the Dark

 is a quest in Fallout: New Vegas.

Detailed walkthrough
This quest is obtained at the Brotherhood of Steel compound at the western entrance to the Hidden Valley bunker. To gain access to the interior of the bunker, the characters needs to have a Lockpick skill of 100 (to open a Very-Hard locked door) or they can simply interact with the intercom on the right after finding the password or getting far enough in any factions storyline to be asked to find the BoS. After the second door opens, you will encounter Senior Paladin Ramos, who will confiscate your gear and lead you to The Elder, who begins the quest. Note: The Paladin Ramos will shoot at the PC if he's dressed as an NCR troop, and removing the outfit will not cause Paladin Ramos to stop engaging the player. You're allowed to enter with your things if you got into the bunker via Veronica's companionship. The Elder will ask you to find the mission logs (you can also oust him with some optional quests and by giving logs to Hardin) The first is by Black Mountain where you'll fight multiple centaurs and Moe (Tabitha's pet) in a radioactive ditch you'll find a dead paladin and his log. The next is at the REPCONN facility with a speech of 60, intelligence of 7, and luck of 7 you can bypass fighting the robots here.

If you discovered the bodies of Brotherhood Paladins anywhere (E.G. the REPCONN facility 3rd floor) the note they have will have a password on it. You can use that password with the intercom next to the door to start the quest. Also if the player has the companion Veronica, she will go to the intercom and talk to Ramos for you, thus letting you in the bunker, while keeping your gear.

Also, if you were sent by House to learn about the Brotherhood of Steel, when entering the bunker from the northern entrance, a patrol will run out. This will cause the door to open, allowing you to enter.

Bugs
After retrieving all the components for the air filtration system and returning them to the Brotherhood, it is possible to tell McNamara that the air filtration system problem is fixed, and he will have a change of judgment about his ways and end the lockdown, ending the quest and giving you EXP. However, after this, even though the quest is completed, you can still go to Hardin and tell him that McNamara broke the Chain That Binds, and you will receive the EXP for completing the quest this way, too. This glitches the game so that Hardin will never oust McNamara and you can never have any actual dialogue with them beyond this point, except from them stating they are preparing for one another.