Remove Force Field

You need to get back to your ship ASAP, but the force field around the facility will prevent you from leaving. Head back along the corridor near the VI to encounter one of the Geth claws that are being used to anchor their ship into the headquarters. You'll need to find a weakness in one of the claws and destroy it.

Lots of quests to pick up here.

Head on a bit until you find the two walkways leading up to the Upper Level. One of them has a few Krogans, as well as the console that Hossle wanted you to access. The other has Geth in it. You can hack the ExoGeni console here to obtain the Investigate Facility galaxy mission. You can also hack the Geth terminal to learn of a force of Geth ships in the Armstrong Nebula; that'll give you another quest, Geth Activities. Another hack, on the Server Node, will result in the Investigate Samples quest. Sheesh.

When you're ready to move on, check the Shuttle Bay Door Control. You need to get the PSI between 31 and 33 to have it chomp through the Geth's landing claw. Toggle the 5, 17, and 11 PSI valves to achieve the high pressure here, then shut the door to unclamp the Geth ship. Sucks to be them.

Exit ExoGeni/Speak With Refugees

Sounds like the Geth are coming for payback. Head downstairs to meet up with Lizbeth and get back to the Mako. When you return to the refugees, Jeong will be going pretty crazy. You'll have to put him down. It's for his own good, really.

Return To Zhu's Hope/Minimize Casualties

Juliana will give you Anti-Thorian Gas that you can use in your grenades. It'll help you disable the colonists in Zhu's Hope without killing them; if you're going renegade, though, you can feel free to kill them. Don't forget to talk to Hossle and turn in his quest, if you completed it.

Some of the corpses in Zhu's Hope have been turned into Thorian Creepers; kill them at will. Take down the colonists with grenades, but be sure you've inserted the anti-Thorian upgrade. After opening the door to the colony, numerous Creepers will appear; you can pop back into the Mako to finish them off, then start grenading the colonists. You'll get two paragon points for each colonist you leave alive, and presumably the same amount of renegade points for each one you kill.

Try to knock out your enemies with grenades or physical attacks.

Make your way into the colony. If you're using grenades to knock out the colonists, you may run out at some point; you can use melee attacks to knock out your foes if that becomes the case, but there's a box of five grenades that you'll find when you reach the primary area of the colony. Continue your path of peace or carnage, take down the colonists, and get to the crane controls. When you lift the crane, the path into the bottom of the facility will open.

Destroy The Thorian

The Thorian speaks through a clone; when the talking's over, kill the clone, then find the small corridor nearby and back up, letting the Creepers come to you. Use grenades or powers to shut them down, then start making your way towards the stairwell nearby. Shoot the Thorian Neural Node to start causing some pain to the Thorian.

The Creepers in this section can be annoying; you may want to have your teammates hold a position, then lure the Creepers back to them so that everyone has a clear line of sight towards the enemies as they come through the door or whatever. Use Lift and Singularity powers, if possible, to separate them and get them on the ground. Keep in mind that they're organics; if you've been using armor-piercing rounds against the Geth, switch to anti-personnel rounds for this section.

Unfortunately there's no romance plot with the Thorian.

Continue upwards, shooting away at the neural nodes that you see. Many of them will cause Creepers to awaken when they get shot, so keep that in mind. Head up to the top of the area and shoot every node in your path; one of them will block the onward path, so keep that in mind. When you reach the end and shoot the last node, Shiala will be freed from her prison. Mindmeld with her to see a more clear version of the beacon's vision. After you do so, you'll return to the colony and will be free to leave. The merchant here will sell you a Haliat Armory license now, if you wish to obtain it.

Return To The Normandy

Make another sweep of the Normandy and talk to your crew. We managed to pick up the Find Wrex's Armor quest from Wrex here, the Find Dr. Saleon mission from Garrus, and get a little more serious with Liara and Kaiden. Speak to everyone before starting the next mission. As you step up to the galaxy map, you'll probably receive a message from the Council. Head to the comm room to find a new mission: Virmire. Since it's the last one you obtained, we'll head to Noveria first.