4. Mass Effect Story Walkthrough - Citadel Visit 1Update notes

CITADEL VISIT 1

Your first visit to the Citadel begins with a cutscene introducing Ambassador Udina talking to the Council.

M2.0: Citadel: Expose Saren

After speaking to Udina leave the office and turn left, proceeding down some stairs and open the door on the left.

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Continue downstairs, passing the Embassy Receptionist behind a desk on your right and go towards the glowing Avina virtual intelligence (VI) hologram on the left. Speak to her if you want to know more about the Citadel Presidium areas, otherwise, walk to the right of Avina where you will see a Rapid Transit console a short distance ahead next to a stationary speeder; these can be used to fast travel to other locations on the Citadel once discovered. Press cn_A, then select Presidium Locations, Citadel Tower to go to the next destination.

Move forwards and observe Executor Pallin talking to Garrus, who will then speak with you. Move past the fountain behind Garrus, go up the stairs, continue forwards passing a small garden, then go upstairs to meet with Anderson, where a cutscene will automatically start involving the Council. This will automatically unlock the two codex entries "Aliens: Council Races: Asari (4/13)" and "Aliens: Council Races: Salarian (5/13)".

A meeting with Udina and Anderson will begin, starting main mission M2.1: Citadel: Garrus. Once Udina leaves, you can ask Anderson "Any other leads"? to let him tell you about Barla Von, which will start another optional main mission Citadel: Shadow Broker; we will ignore this one since it simply leads you to find Wrex which we will do later anyway.

Before proceeding with M2.1 we can now scan the Keepers on the Citadel to level up for the power/ability achievements and find Codex entries for the Scholar achievement; it is also a good idea to interact with various items mentioned below to gain further experience points (XP). This assignment must be skipped until later on if you are going for the ally achievements since you will not have acquired all of your squad members yet.

C1: Citadel: Scan the Keepers

Talk with the Salarian named Chorban at the foot of the stairs after the Council audience in the Citadel Tower. Select "Following the keepers?", "Let me help" then "I'm with the Alliance" to start the assignment. Also, select "Why are you doing this?" to unlock the Aliens: Non-Council Races: Keepers (6/13)" codex entry (there is another opportunity to get this).

Scan the first keeper immediately on your left (1/21).

K1

Go back up the stairs you just came down from and go right where you will see a keeper in the far corner (2/21).

K2

Return to the stairs and turn right, moving past Rear Admiral Kahoku (ignore him for now) and scan the keeper in the left corner (3/21).

K3

Go to the Rapid Transit console near the first keeper and move north past the rocks and trees to spot another keeper (4/21) to the left of the stairs.

K4

Go down the nearby stairs, pass the fountain where you first met Garrus and enter the elevator in front of you to travel to the Presidium. As you exit the elevator, move forward and scan the keeper directly ahead (5/21) next to another Avina VI. This is another opportunity to obtain the Keeper codex entry. Speak to Avina here, selecting "Virtual guide?" then "Sounds interesting" if this is your first interaction with her, then choose "Investigate" then "Keepers" to unlock "Aliens: Non-Council Races: Keepers (6/13)".

K5

Go left, passing the bench and tree area and scan the keeper in the distance to the left next to the corridor towards the Wards (6/21).

K6

Pass the C-Sec officer and Preaching Hanar on your right (we will interact with these later) and go across the bridge in the direction of the Financial District, leading to another Rapid Transit console. Follow the path left (the first office on the right is where Barla Von is located) where you will see a large Emporium shop floor-space on your right. Enter the shop and speak with the Emporium shopkeeper. Select "Personal question", "Investigate" then choose "Your speech" to unlock the "Alien: Non-Council Races: Hanar (7/13)" codex entry. Move up the stairs behind the Hanar and go left to scan a keeper (7/21).

K7

Go back past the Hanar and turn right. Follow the path until you see a large Krogan statue in the water to your left. Talk to Avina here and select "Investigate" then "Rachni Wars" to unlock the codex entry "Aliens: Extinct Races: Rachni (8/13)". Turn around and move forwards towards another keeper on the left (8/21).

K8

Continue left up the stairs, then go right along the walkway and interact with the "Welcome to the Presidium" sign on the wall to gain some more XP. You will then see a keeper in the corner (9/21) to the left of the entrance to the Consort's chambers (we will investigate this area later).

K9

Turn around and go back up the stairs, this time turning right, following the direction of the orange arrow pointing towards C-Sec and the Embassies. Follow the curved path and go right at the intersection, moving past the transit console and Avina towards the Embassies, and continue up the stairs to the right of the Embassy receptionist. Open the door, go up the stairs on the right and continue forwards until you reach the Elcor and Volus Embassy. Inside this room is a keeper in the corner on the left (10/21). If this keeper is missing you can sometimes scan the nearby floor, otherwise save your game here then reload it and it should reappear for you to scan.

K10

Speak to the Elcor named Calyn behind the desk, selecting "Investigate" then "Elcor", then "History" and/or "Culture" to unlock the codex entry "Aliens: Non-Council Races: Elcor (9/13)". Next talk to the Volus ambassador Din Korlack to his left, selecting "Investigate" then "Volus" followed by either "History" and/or "Culture to unlock the codex entry "Aliens: Non-Council Races: Volus (10/13)".

Go back to the Embassy receptionist and continue up the stairs to her right. Open the door, then go right towards another door, then scan the keeper at the right end of this room behind an Elcor Diplomat (11/21). Interact with the two Diplomatic Archives on the computer terminals on the side opposite to the entrance to gain some XP.

K11

Exit this room and go right along the corridor, passing Executor Pallin's office on your left and entering the Embassy Lounge. Move towards an opened door at the back, to the right of the Bartender, and turn right to see another keeper (12/21).

K12

Return to the main Embassy area, passing Pallin's office, opening the next door on the right and continue down the stairs. When you approach Avina, go left and walk down the curved path to enter the C-Sec Academy elevator to the right of the 09 sign on the wall. After using the elevator, use the other elevator directly in front of you to go to the Docking Bay. Move forwards, with the Normandy on your left, to spot a keeper at the end of the walkway on the right (13/21).

K13

Go back down to C-Sec in the elevator and turn right, going down the short flight of stairs to spot a keeper next to the doorway on your left (14/21) in the Requisition Officer's room.

K14

Turn around and go back, passing the Docking Bay elevator to enter the other side of the C-Sec Offices area. Follow the stairs up and go towards another set of stairs in the distance, which eventually leads to a keeper on the right (15/21) next to Citadel traffic controllers. There is a "Tracking Terminal" in front of you as you enter this room, another one on the left, a "Weapons Locker" inside the room on the left next to an inactive elevator (if you don't already have its codex entry), and another 2 terminals on the right as you exit the control room.

K15

Go back to the main Docking Bay elevator, turning right towards a short flight of stairs that leads to another elevator (behind the main one) guarded by an officer. Interact with the "Welcome to C-Sec" sign on the wall in front of this elevator to gain some XP, then use the lift to go to the Wards. Exit and move down the long corridor, where you will then spot a keeper in front of you next to Officer Lang (16/21).

K16

Interact with the nearby "Public Extranet Terminal" then go up the stairs, turning left at the top to go towards the Med Clinic, and scan the keeper in the corner (17/21) to the right of the Clinic, as well as interacting with the "View of Nebula" icon directly opposite the door for some XP.

K17

Turn around, return to the staircase but this time continue forward. You will see a doorway to the right of some stairs that leads to Flux, opposite Emily Wong. Behind her, you can interact with the "Scenic View" (no XP gain) at the window on the left where you can flirt with Ashley or Kaidan depending on your gender by selecting "What's not to like?".

Interact with the "Welcome to the Wards" sign opposite Emily then enter the nearby door and use the "To Presidium" lift.

CitadelDoor

When you exit, turn left and you will see a keeper (18/21) in the next room on your immediate right.

K18

Turn around and re-enter the previous elevator. When you exit, open the door to your immediate right to scan the keeper in the red-lit area (19/21).

K19

Turn around again and go right to return to Emily Wong. Go up the stairs in front of her (on your right) and follow the corridor round to enter Flux. Once inside Flux, go up the stairs on the right and see the keeper in the far left corner behind the Quasar gambling machines (20/21).

K20

Leave Flux and go back to Emily Wong, continue right and enter the door towards the Upper Market area. Move forwards and eventually on your right in the far corner behind the kiosks you will see the final keeper (21/21) to the left of the Volus shopkeeper named Expat.

K21

You should now be at Level 5, where recommended choices for the ability achievements are:

Engineer Lv 5: 1 in Medicine for Neural Shock, 2 in Decryption

Adept Lv5: 1 in Throw to unlock Lift, 1 in Lift, 1 in Warp, 3 unused points

We will now proceed with the main quest again.

M2.1: Citadel: Garrus

Travel to Chora's Den (Wards Locations). Move forward through the doorway and get rid of the two Assassin's who will immediately attack you from the left on the other side.

Proceed to the doorway at the upper left corner of this area and enter Chora's Den. Move round the bar to start a cutscene with Wrex and a Krogan Bouncer. This automatically unlocks the "Aliens: Non-Council Races: Krogan (11/13)" codex. Next, speak to Harkin on your right, choosing renegade options for some amusing banter if playing as a female. This conversation will eventually lead to you look for Garrus in Dr. Michel's Med Clinic. Leave the club and go back to the transit console, selecting Wards Locations then Med Clinic.

Open the Clinic door, starting a cutscene involving Dr. Michel and Garrus, and be prepared to eliminate the enemies in the room, using sabotage on the fire containment system and be aware of those hiding behind the crates at the back (use grenades with cn_back). Afterward, speak to Garrus in the room and choose "Quarian?" to unlock the "Aliens: Non-Council Races: Quarians (12/13)" codex entry. Garrus will now join your squad. If you are going for his ally achievement, select him now and keep on choosing him throughout the game.

This completes the mission and starts M2.2: Citadel: Wrex. You can talk to Dr. Michel next to you to get her short backstory, and you can replenish your medi-gel using the Aid Station on the nearby wall. You should now be at Level 6, where for the Adept class you have a choice of either unlocking Stasis or Singularity:

Engineer Lv6: 1 in Decryption to unlock AI hacking, 1 in AI hacking (all achievement abilities now unlocked)

Adept Lv6: 1 in Warp to unlock Singularity, 3 in Barrier to unlock Stasis, then either 1 in Singularity or 1 in Stasis (manually save the game beforehand to allow both options)

M2.2: Citadel: Wrex

Leave the Med Clinic, go to C-Sec (Wards Locations, or from the Embassies go down the ramp behind Avina and enter the elevator on your right) and approach Wrex standing next to C-Sec officers directly ahead. He will automatically talk to you about Fist and join your squad, completing the mission. If you are going for his ally achievement, select Wrex to be in your squad now and keep on choosing him for the rest of the game.

M2.0: Citadel: Expose Saren

Return back to Chora's Den, using the Rapid Transit console behind you in between the two lifts and selecting Wards Locations, Chora's Den. This is the ideal location to grind out the Engineer and Adept ability achievements since you can now use all unlocked powers on the enemies (everywhere) inside the Den in two stages: a) the first fight before you reach Fist and b) Fist's fight itself. You can also use your Adept abilities on fast travel terminals, which is a much simpler process which we will explain later on.

  1. Make a manual save before entering Chora's Den, which we will label as Save1.
  2. Enter the Den and use all of Shepard's powers on the enemies, taking care to aim at each enemy before using the power so that they successfully register.
  3. Let Shepard or any member of your squad get injured and use medi-gel once.
  4. Reload manual Save1 before Chora's Den and repeat from step 2.

For the Engineer, suggested actions are to first cast Neural Shock on the enemy directly in front of you in the distance (who moves to the right) as you enter, followed by Sabotage on the Bartender to your immediate left, Overload on the enemy on the right in the far distance who takes cover by the wall, then Damping on the Bartender who appears on the left side of the room. Be careful of the enemy on top of the bar and the Krogan Bouncer that appears.

The game registers power usage with your Gamertag profile and not the chronological order of your particular game save. However, you must reach a checkpoint or manually save again if you want your achievement progress to be saved if you do not want to tackle this in one uninterrupted sitting (taking just below an hour or so). One option is to repeat steps 2) to 4) until you have done this 10 or 20 times, then proceed to eliminate all enemies in the bar area, then before opening the door to meet Fist make a different manual save, keeping Save1; your power use achievement progress is now saved. Then reload Save1 again and repeat the loop.

Assuming you have persevered with this procedure 75 times you will be at the halfway point of unlocking the First Aid achievement and you will also unlock:

After eliminating the enemies in the bar area open the door at the other end to talk some workers who are blocking the way; if you move before speaking to them they will attack. Before we enter the next room to meet Fist, who will immediately attack you along with two turrets that appear after a few seconds, we can use the Engineer class to obtain the AI Hacking achievement and finish off the medi-gel one as well:

  1. Make a manual Save2 before entering Fist's room.
  2. Enter the room and use AI Hacking on the (rightmost) turret then let Shepard or a member of your squad get injured and use one medi-gel.
  3. Reload manual Save2 and repeat step 2.

If you need to save your hacking and medi-gel progress, say after 10 reloads, finish off the fight with Fist (destroy both turrets to end the battle quickly), then after interrogating him (press cn_X to skip dialogue) an auto-save will occur. Then reload manual Save2 again and repeat the loop. After around 40 minutes or so you will have hacked the turrets and used more medi-gel 75 times unlocking:

Pick up the Optical Storage Disk (OSD) on the ground in front of you to start the assignment "C6: Citadel: Reporter's Request" which we will complete later and optionally unlock the Wall Safe. You now have 4 minutes to rescue the Quarian (pressing cn_start pauses the game). Retrace your steps and exit Chora's Den, eliminating more enemies along the way.

Move past the transit console and enter the left door (the right one is locked for now) and move through the corridor bathed in red light. After a cutscene and eliminating the three Assassins, you will talk to Tali, leading to a meeting scene with Udina in his office together with Anderson. Tali will then join your squad; if you are going for the Quarian ally achievement, select Tali now and use her throughout the rest of the game.

For the Adept, assuming you have done all of the quests thus far, you will now be at Level 7 and can unlock the final power:

Adept Lv7: 1 in empty Singularity or Stasis, 1 point anywhere else

and you can grind out the biotic ability achievements by casting them on a fast travel console. Leave Udina's office, go left down the stairs, ignoring Samesh Bhatia in front of you for now, then move to the Embassy fast travel console just past Avina.

  1. Make a manual save in front of the Transit console
  2. Aim your gun recticle over the blue circle on top of the console. Hold cn_RB, use cn_LS to choose a power, press cn_A to see a red triangle overlap the blue circle, then release cn_RB to cast the ability.
  3. Move onto the next power once the red triangle disappears. Suggested actions are to first cast Barrier on yourself, then use Warp, Lift, Throw, Singularity and Stasis on the console.
  4. Reload the manual save and repeat step 2.

Biotics

To save your achievement progress you can simply use the console to fast travel to another random destination, which creates an auto-save, then repeat the procedure on the new console or reload the manual save. Note that all biotic powers have a nominal cooldown timer of 1 minute, so it is quicker to use the reloading technique instead of waiting for the cooldown to finish (taking approximately 45 minutes when reloading, at least 75 minutes waiting for cooldowns). After persevering with this you will unlock:

Go to the Citadel Tower (Presidium Locations), turn around then go up the stairs to automatically start a cutscene with the Council. Congratulations, you are now a Spectre, unlocking

Go to C-Sec (Wards Locations) then enter the Docking Bay elevator. Speak to Ambassador Udina in front of the Normandy, completing the main Citadel mission. This will also start three other main quests: M3.0: Feros: Geth Attack, M4.0: Find Liara T'Soni and M5.0: Noveria: Geth Interest.

When Udina leaves, speak to Anderson and ask "You and Saren have a past", then "What happened?" followed by responses to let him tell his story, and this will unlock the codex entry "Aliens: Non-Council: Batarians (13/13)". Assuming you have got all of the other codex entries mentioned earlier, this will unlock

  • Scholar

    Find all primary Alien: Council Races, Extinct Races and Non-Council Races codex entries

    Scholar

You can now enter the Normandy ship to travel to new worlds and continue the main quests. If you want to get the Asari Ally achievement, it is now mandatory that you complete main mission M4.0 to recruit Liara before doing anything else. This is also a good time to travel to the uncharted world of Eletania that is on the way to Feros if you want to grind out all weapon-based achievements (around an hour or so for Sniper, getting easier and quicker with Pistol, Shotgun, and Assault Rifle, in that order); please refer to the U1: UNC: Lost Module assignment.

If you don't want to continue playing as the Engineer or Adept after obtaining their respective power achievements, now is a good time to start the game again with your preferred class (with an additional bonus power if its achievement has been unlocked) that you will use for the 3 full playthroughs.

The remainder of this section will cover the other available Citadel assignments, some of which will (optionally) unlock quests on other planets. Note that these can be done at any time by returning to the Citadel, although its recommended that they be completed before finishing all three new main missions, since new assignments appear on subsequent visits to the Citadel, and there is a point of "no return" towards the game's end; if you leave it too late these quests become unavailable. Re-enter the elevator and go back down to C-Sec, and fast travel to the Embassy (Presidium Locations).

C2: Citadel: Homecoming

Speak to Samesh Bhatia next to Avina in the Embassy area. Turn around and go up the stairs, through the door, then turn left, continuing towards the door to the Lounge area, passing Executor Pallin's office on your left. Speak to Clerk Bosker who is leaning against the wall in front of you and tell him what you want him to do. Go back to Bhatia and inform him of the outcome, which ends the quest.

C3: Citadel: Asari Consort

Go to Presidium Locations, Consort Chambers. Enter and speak with Nelyna. As you start to leave the consort Sha'ira will let Nelyna know that she wants to meet you. Enter the Chambers and take the stairs up and to the right. Open the door and speak with Sha'ira, who will ask you to talk to General Septimus. Say "Okay/I'll see", leave Sha'ira then fast travel to Chora's Den in the Wards by using the transit terminal on your left as you exit the Consort Chambers.

Enter the Den, then proceed to the right around the bar and talk to Septimus who is sitting down left of the standing Krogan. Begin with "Sha'ira sent me", and choose right side options if you can't select the Paragon/Renegade choices. When asked about earning some extra credits, choose "Sure/Depends", then "How?/Why me?" followed by "Where to?/ All right." This will also start the assignment C4: Citadel: Xeltan's Complaint. It is recommended that you complete this new assignment first before continuing.

Go back to Sha'ira selecting Presidium Locations, Consort Chambers on a fast travel console and inform her of your talk with Septimus (and optionally Xeltan). She will reward you with credits, a special trinket if you completed Xeltan's quest and some words of wisdom. Finishing with "That's it?" will make Sha'ira share an intimate moment with Shepard which has no impact on romance options.

C4: Citadel: Xeltan's Complaint

If you obtained this quest from Septimus, proceed to the Elcor and Volus Embassy. Use the transit console to go to the Embassies, then go past Avina and up the stairs to the right. Open the door and continue upwards to the right until you enter the Embassy room (passing Udina's office). Talk to Xeltan on the right, starting with "That's why I'm here". The quest ends after completing the conversation. Finishing with "Don't worry" provides +2 Paragon points, so avoid this choice if playing as a Renegade.

C5: Citadel: Presidium Prophet

Fast travel to Wards Access (Presidium Locations), turn around and speak with either the C-Sec Officer or the Preaching Hanar. If you choose the Officer, say "It's not smart enough" then continue with any other dialogue options. If you choose the Hanar first, select any dialogue (right side) options.

To make the Hanar leave, select "You're breaking the law" or "This isn't the way", then choose the Renegade/Paragon options if available, then speak to the Officer to get XP and omni-gel, completing the quest.

If you want the Hanar to remain and continue preaching, select any option on the right twice when speaking to it, then speak to the Officer again. Select "Let the hanar talk" or "Leave the hanar alone", then try to persuade the Officer. When he leaves, talk to the Hanar to complete the quest.

Another alternative is to buy the required permit for 150 credits; speak to the Hanar, select "You're breaking the law" or "This isn't the way", then choose "Could I buy your permit?" then finish with "You do now" on the top right. The Hanar disappears (presumably to preach elsewhere) and talk again to the Officer to complete the quest.

C6: Citadel: Reporter's Request

Assuming you picked up the OSD from Fist's office in Chora's Den (you can go back and reenter this location), fast travel to Flux (Wards Locations) then turn around, opening the door, continuing right until you spot Emily Wong calling out to you. Alternatively, go to Markets (Wards Locations) then go right, opening the door and continue forwards. Speak to her and select "Would these help?" or "I found some disks", ending the quest and opening the way for more interactions with her later on.

C7a: Citadel: The Fan

Fast travel to Markets (Wards Locations) and move forward until you see Conrad Verner on top of the stairs, to the right of the Volus merchant named Expat. Speak with him, selecting any dialogue options and expect to meet him again the next time you're on the Citadel (which we will do after the next major quest is completed).

C8: Citadel: Doctor Michel

Fast travel to the Med Clinic (Wards Locations) and you will see Dr. Michel talking to a blackmailer, which only occurs if you have first spoken to her after recruiting Garrus. If you do not see the blackmailing scene, talk to her now, leave the Clinic, fast travel somewhere random using the nearby transit terminal, then travel back. You can then help her by selecting "I can help" followed by "I'll help you" or "I'll make the delivery".

Leave the Clinic then fast travel to Chora's Den. Turn around and open the door on your right next to the orange arrow and see Morlan immediately on your left. Say "I'm here about Dr. Michel", then speak to the Krogan that appears. Either persuade or fight the Krogan, after which you will talk to Morlan again; ask "Who's Banes?".

Open the door to the left of him and use the fast travel terminal to go back to the Med Clinic (Wards Locations). Speak to Dr. Michel again to finish the quest (ask "Banes") and obtain a permanent discount when purchasing her medical supplies.

C9: Citadel: Rita's Sister

Enter Flux (Wards Locations) and speak to Rita at the bar next to the Volus barkeeper Doran. Say "Problems?" then "It's okay. Go on" or "Just tell me!" and Rita will tell you about her sister Jenna working at Chora's Den. Select "Have you talked to C-Sec?" to start her assignment and agree to help her. When the conversation ends you can talk to Doran.

Leave Flux then fast travel to Chora's Den (Wards Locations) using the nearby transit terminal. Enter the Den and go right until you spot Jenna working behind the bar. Speak to her, then head to the exit. As you start to leave, a Turian named Chellick bumps into you and suggests you meet him. To do so, fast travel to C-Sec (Wards Locations) using the nearby transit terminal.

Move forward past the Docking Bay elevator, go up the stairs towards the right, turn left at the top then enter the second room on the left. Speak to Chellick, eventually selecting "Sure" or "All right" to find the arms dealer Jax.

Go back to the Docking Bay elevator and fast travel to Chora's Den (Wards Locations) using the nearby transit console. Turn around, enter the Lower Markets door and speak to the Krogan Jax at the other end of the room. Afterward, go back to Chellick in C-Sec (Wards Locations) and inform him of the meeting outcome, ending the quest.

Later on, you can go back and speak to Rita in Flux to let her know what happened; Jenna is located at the top of the stairs just before the Quasar machines but does not offer any other significant dialogue.

C10: Citadel: Jahleed's Fears

Fast travel to C-Sec (Wards Locations), move forwards past the Docking Bay elevator and go up the stairs that turn right. As you turn left you will see a blue-lit area with a single pink tree on your right opposite the two offices. Talk to the Volus Jahleed who is conversing with a C-Sec officer. Say "I overheard you" or "Who are you?", then "How can I help?" or "What do you need?" followed by "I'll talk to him" or "Yes. I'll help you" to start his quest.

Go back to the Docking Bay elevator and use the nearby transit console to fast travel to Chora's Den in the Wards. Turn around and open the nearby door to enter the Lower Markets. Speak with Chorban standing in front of you, selecting any dialogue options.

Since we have already scanned the Keepers the next task is to simply go back and speak to Jahleed at the same C-Sec location as before (in the Wards), which ends the quest.

C11: Citadel: Schells the Gambler

Return to Flux after starting assignment C9 Rita's Sister and you will see a gambler named Schells thrown out. Speak to him and say "What happened?" or "You cheated?", then eventually follow on with "Let me do it" to start his quest.

Enter Flux and go to the Quasar gambling machines on top of the stairs to your right. Interact with any of the machines and try to get close to 20 without going over. Do this 5 times and you will have enough data for Schells. Do it 7 times and the Flux owner Doran confiscates the device and any credits you have won.

Alternatively, you can give the device directly to Doran, who is standing at the back behind the machines next to the Flux Keeper. Let Schells know what happened (each outcome gives no morality gain), ending the quest.

C12: Citadel: Signal Tracking

Enter Flux, go upstairs and go to the Keeper behind the Quasar gambling machines. Next to the creature is a Suspicious Gambling Machine. Examine this to start the quest.

Leave Flux and use the nearby fast transit terminal to go to Wards Access (Presidium Locations). Go down the stairs in front of you, follow the path and use the elevator at the end of the corridor. Exit, go left and enter the open area on your left. Interact with the Signal Source on the upper left screen.

Turn around, go right back to the elevator and return to the Wards Access area in the Presidium by following the long corridor. Continue onward, past the trees and crossing the bridge, or use the fast travel console to go to the Financial District (Presidium Locations). Enter Barla Von's office that is nearby and investigate the Signal Source on the computer behind him.

Leave this office and enter the Emporium shop on the right. Go up the stairs past the Hanar Shopkeeper and turn right. Investigate the final Signal Source in front of you and you will start a conversation with the AI. You then need to stop its self-destruction. Interact with the terminal, then press cn_Y, cn_X, cn_Y, cn_A, cn_X, cn_A and cn_A to turn it off, ending the quest.

We will now initiate some quests that will involve traveling to other uncharted (UNC) star systems using the Normandy; these will automatically start if you simply travel to the appropriate uncharted worlds.

U16a: UNC: Hostile Takeover

Speak to Helena Blake who is standing opposite the Emporium in the Presidium Financial District. Choose "I'll do it" to start her quest.

U9: UNC: Unusual Readings, leads to Distress Call

Go to Ambassador Udina's office in the Presidium Embassy area and hack the computer console to the left with Easy Decryption to start this quest.

U18: UNC: Strange Transmission, leads to Major Kyle

Go to Executor Pallin's office in the Presidium Embassy area (go up the stairs to the left of the Embassy Receptionist and enter the first office on the left after opening the door) and hack an Easy Decryption terminal on the left behind the screen to start this quest.

U3a: UNC: Missing Marines

Fast travel to the Citadel Tower (Presidium Locations) and go left to speak to Rear Admiral Kahoku. Say "Problems" to begin his quest.

Assuming you talked about Banes in C8, Dr. Michel's assignment, speak with Captain Anderson (either next to the Normandy or in Udina's office), then speak to Kahoku again, asking about "Banes" followed by "Why didn't you tell me?" to get more backstory here.

U10a: UNC: Privateers

Fast travel to the Presidium Citadel Tower, turn around and speak to Garoth who is standing on top of the staircase after passing the tree and rock area ahead. Say "What's wrong?" then say "I'll do it" or "I'll see what I can do" to start his quest.

U14: UNC: Hostage

You may hear a news report when using an elevator about a hostage situation, which will automatically start this quest.

U15: UNC: Missing Survey Team

You may hear a news report when using an elevator about a missing survey team, which will automatically start this quest.

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