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Singularity Hints
Find the Train
1 of 12: Crouch-walk off the platform and move slowly toward the stairs that lead down to the ground. A few soldiers will appear nearby, so quickly snipe them down. (Note that how many soldiers there are seems to be random, so if there's more than two or three, you might want to reload the checkpoint and try again.)
2 of 12: Go toward the double doors in the back of the area, ready to quickly snipe the soldier who opens them. After he's down, adjust your weapon inventory to include the assault rifle and the shotgun (you can get both from the dead soldiers), then check a side area for E99 tech before going through the soldier-opened doors.
3 of 12: Go up the first set of stairs, then turn and look on the wall past the second set to see an echo zek that's waiting for you.
4 of 12: In the room past the stairs, get the blueprint for the Search and Destroy equipment upgrade, then go through the crawlhole to drop down and get a checkpoint save. Exploit it using the tip below, then figure out how to get past two fast-spinning fans.
5 of 12: Past a short walkway, climb the little ladder and grab the health pack, then wait for your TMD meter to recharge before dropping down into a "ghost replay" area. After the replay is over, the echo zek will attack. (TIP: De-age and loot the ammo crate on the left before the replay ends.)
6 of 12: Reload the checkpoint save you got when you killed the echo zek to restore your health, then de-age and loot the ammo and health pack crates. Look for more supplies as you go up some stairs. After that, drop through a big floor hole and fight a couple of regular zeks.
8 of 12: Go through the doors and enter the big elevator, then use its control to descend to the sewers. You need to make your way through them and meet up with Kathryn on the other side.
9 of 12: After a brief noninteractive cut-scene, you'll get a checkpoint save. Peek out the doorway and look to the right to find a soldier to age, then follow Kathryn over to the new autocannon weapon. Trade your assault rifle for it, then follow Kathryn to a door.
10 of 12: Move up to her and give her a boost (Use key) so she can open that door, then follow her over to a large garage door. Predictably enough, she'll need your help in getting it open, too.
11 of 12: After Kathryn exits the garage, enemy soldiers will show up, and you'll get the "Defend Kathryn" objective. After you finish it and the "Rescue Kathryn" objective, follow Kathryn to an open office that has two bio formulas in it (Defensive and a randomly chosen one).
