Still in the Dark

 is a quest in Fallout: New Vegas.

Quick Walkthrough

 * Locate BoS in Hidden Valley Bunker
 * Speak with Paladin Ramos
 * Make your way to Elder McNamara
 * Deal with the NCR Ranger
 * Speak with Elder McNamara
 * Retrieve 3 Holodisks from fallen Brotherhood Paladins
 * Return to Elder McNamara
 * Meet with 3 Brotherhood scouts and obtain their reports
 * Give Elder McNamara

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 character needs to either have a Lockpick skill of 100 (Very Hard lock) or perform certain other actions to be able to interact with the intercom, such as:

-> Discovering the bodies of Brotherhood Paladins anywhere (E.g. the REPCONN facility's 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.

-> Being sent by Mr. 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.

-> Getting far enough in any factions storyline to be asked to find the Brotherhood of Steel.

-> Having Veronica as a companion, which allows you to use the intercom to open the gate.

After the second door opens, you will encounter Senior Paladin Ramos, who will confiscate your gear and lead you to The Elder, who begins this 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.

The Elder will start you off by telling you that he does not trust you and fits you with an explosive collar, designed to go off if you wander too far from the Brotherhood bunker. He then tells you a certain NCR ranger has set up shop nearby and wants you to oust him from his post. Once you have dealt with the ranger, he rewards you by taking the collar off and giving you the next part of the quest: To locate several patrols that have gone missing, and to bring them back, if they are still alive, and if they are not, to retrieve the mission holotapes that were given to them. Note: if Veronica is with you the Elder will not put the explosive colar on you and will skip to the search for the patrols. (Xbox 360 Confirmed)

The moment you exit the Elder's chamber, you confronted by Head Paladin Hardin who tells you that he believes the Elder's policy of keeping them isolated from the outside worls will be their doom, and wants you to help him oust Elder McNamara. He asks you to find out more about what leads to an Elder being replaced and tells you to update him on all the quests the Elder gives you. These are all marked as optional parts of the same quest.

There are three locations you go to find the holotapes. One is by Black Mountain where you will fight multiple centaurs and Moe (Tabitha's pet) in a radioactive ditch, where two dead paladins and the log lie. Another is at the REPCONN facility, where with a speech of 60, intelligence of 7, and luck of 7 you can bypass fighting the robots entirely. The last log involves finding the Boomers by dodging their artillery. Once you have made contact with them, you are free to roam around the surrounding area and find the two dead Paladins.

REPCONN facility

Once in take the tour with the tour guide, once in the final room kill the robot and steal the key. Proceed through to the Planatorium and through the next door up the stairs and get the keycard. Go back to the initial room and go though the locked door using your keycard...



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.