Base Visit I: Welcome to XCOM | Walkthrough The Bureau Guide
Last update: 11 May 2016
Beginning sequence is not interactive, agent Carter has a tour around the Bureau. Only after a longer moment you regain control.
Your first interactive action here is a conversation with agent Nico DaSilva. Choices made in this conversation won't affect anything in the future, so you can play it as you like.
If you're interested in the past of your newly gained friend, you can look into his files on your desk (your own files are on the DaSilva's desk, on the opposite).
When you exit the room, another cut scene triggers. After that, another conversation with DaSilva, during which you can talk about radio. If you do so, you begin an Investigation: Radio Interference (otherwise, the mission begins automatically a moment later).
Independently on your action with radio, you'll have to meet Faulke in his office. To do so, leave Carter's office and go upstairs (stairs on the left side of the room with a display). But before you talk with your chef, listen to recordings - one can be found in the office, the other one in opposite room. By the way you can also read a note from the Faulke's secretary desk. You don't have to bother with collectibles if you don't want to - they don't affect the storyline.
After a conversation with Faulke (during which you have no important decision to make) you have to meet with DaSilva. Go on the lower floor of the base and walk through door with two guards. Then turn right and enter a big room with soldiers. By the way you can listen to recordings, read a letter in the corner and watch a photo at the table with maps. When it's done, approach the computer in the middle of the room and choose two new agents to your squad (look at chapter: Classes and Abilities).
When you walk off from the computer, you get a message from agent Nils - he tells you that something bad is happening in the mortuary. Exit this room using the door on left and then head for an elevator at the end of corridor. You'll be moved to a hangar with helicopter. On the right you see files on the pile of cartons: you can look at them if you want.
Turn left and enter the mortuary. Being in the vestibule, read a medical note hanging on the cupboard with medicines (left side of room). Then prepare for a storyline twist and fight because the next room is a picture of disaster. Follow the blood trails until you get to the body of agent Nils. In this moment you find an alien Infiltrator and the battle begins.
Infiltrator is an advanced enemy. He can summon Sectoids, throw grenades and deal big damage. He has also a regenerating shield. She can't be affected with Taunt, so commandos tactic is a failure. The best way to fight is to conduct a massive fire and throw grenades. You shouldn't bothered with summoned Sectoids, they'll appear as long as their commander lives. The most important is to eliminate the main target ASAP and don't let his shield to regenerate.
Return to Faulke and report. On your way you can talk with agent DaSilva at the helicopter, Web in the ready room, new agent on the Firing Range and Percy in Hiring Room. None of this conversation matters: you can make them, but you don't have to. Notice also a note attached at the door to Firing Range.
On your way to Faulke, you'll be accosted by doctor Heinrich Dresner, who gives you a weird device. It's a good moment to make a detour and search freshly unlocked locations. First, turn right and look for a note next to the cartons nearby Operations. Then go through Disinfection Room and enter the doctor's laboratory. There, you find four more notes and you can talk with Krut and doctor Dresner. It doesn't have meaning for a storyline, but you should know the history better, right?
When all those things are done, enter the Operations and meet Faulke. Then approach the computer in the middle of the room and launch another mission - The Doctor (others are unavailable). You'll return to the Bureau only after finishing it so make sure, that you've done all necessary things. It's important, because after every missions new collectibles and dialogue options appear and the base changes. So if you don't do something now, you won't have a chance for making it later.