Welcome to the Big Empty

Welcome to the Big Empty is the first main story quest in the Fallout: New Vegas add-on, Old World Blues.

Quick walkthrough

 * 1) Arrive at The Sink balcony.
 * 2) Take the elevator to The Think Tank.
 * 3) Agree to help the doctors.

Detailed walkthrough
After being teleported to Big MT, the Courier will be standing on The Sink balcony, facing outwards towards the expanse of the Big Empty. Enter the nearest door into the Sink. Proceed to the elevators. Enter the right elevator to go to the Think Tank. Note that this is the only elevator that you can use at the moment. Due to an overwhelming feeling of pacifism, the courier won't be able to draw a weapon in the Think Tank. This is so that you will not be able to harm the doctors, and it was a method put in place after an attack on the Think Tank by Elijah, which led to 8|Dr. 8's voice module being damaged, and the destruction of the Big Empty's multiple train tunnels. When you approach the doctors (who appear as floating brain computers), they will address the courier, and the courier will learn about The Big Empty, the various changes they have made to the courier's body, and about Doctor Mobius.

After agreeing to help the Doctors against Mobius, they will assign the courier the Sink Central Intelligence Unit.

Through various conversation options, the courier will be able to talk the doctors into giving various items to help in the courier's quest. The scientists give the sonic emitter - revelation. With an Energy Weapons check of 50, more ammunition for it will be given. With a successful Guns check, also of 50, the scientists also gives the courier, the K9000 cyberdog gun; with a Guns check of 75, more ammunition for it will be given. Other items include doctor's bags, stimpaks, bottle caps, and various skill magazines, after successful Barter checks of 25, 50, 75, and 90.

You cannot exit the Think Tank until you finish this quest.

Bugs

 * Upon spawning on The Sink balcony at the beginning of the quest, the game may freeze. Restarting the system, and reloading the autosave will take you right back to The Sink Balcony. There is very strong, almost stand-still lag. Resetting the will usually fix this problem.
 * The lag does persist, but only if you return to or remain at the balcony. Reloading the save and/or restarting does not seem to help. There is always stand-still lag, even when you are trying to look around. Entering The Sink will usually fix this issue.

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