Finding the source of the tremors is one of the key objectives in Control Resonant’s Evacuation Procedures mission. You will have to break down several Hiss orbs, restore power to a garage, and travel along 1065 Lexington Avenue. This guide explains the way from the Evacuation Zone to the 15th floor, where the task finally changes.
Clear the Hiss Orbs Outside the Evac Building
When you make your way to the Evacuation Zone, locate the big structure characterized by the large red Hiss formation on the rooftop. At first, you won’t be able to access the entrance. To get into the building, three Hiss orbs have to be destroyed first. You can use the red Hiss trails and floating objects to find the locations of the orbs.
The first orb is located in front of the Evac Building in an open area. Destroy it and then move on to the second orb.
The second orb is located to the southwest of the building, in an alley beyond one of the intersections. There are many Hiss enemies in this location, as well as two healing orbs. Make sure to take care of these healing orbs first before fighting the other enemies in the vicinity.
The red trail will take you to a door that does not open, so you have to find the marked Power Core Station to charge your power.
Restore Power to the Garage
Once the charge is collected, you will need to move it to the nearest rooftop. You can take the exterior route using awnings, fire escapes, and scaffolding until getting to the power generator or power box where the yellow wire ends.
Set the power core into the outlet in order to turn on the electricity. This activates the machinery that connects to the garage below.
Proceed back to the garage and get inside. You will be able to reach the previously inaccessible Hiss orb now.
You have to destroy this orb before you can get to the Evac Building. It is found north from the building, near the shielded flying enemies. Get rid of the ones then use the loop roof to reach the orb.
When the three Hiss orbs are destroyed, proceed to the Evac Building. You can access its entrance now.
Reach the Upper Floors of 1065 Lexington Avenue
Get inside the building and ride the lift situated on your left side in order to reach the 12th floor.
Proceed along the indicated path towards the large empty space filled with the enemies called Hiss. Eliminate the enemies and find the way to the corridor having the blue light at its beginning. After that, continue through the scaffolding as well as the construction area.
While moving forward, you will enter the red corridor resulting in a vision sequence. When the sequence ends, carry on moving through the building. In a short while, you will come to the room where there is a Hiss glob inside. Get rid of it to reach the next elevator. Catch the elevator to reach the 15th floor.
Follow the Tremors to the Survivor
Walk through the corridor on the 15th floor, following cries in the distance. You will have another vision sequence as you walk.
Make your way towards the red room at the end of the road. When you get to the room, your Find the Source of the Tremors objective changes to Locate the Survivor. This indicates completion of the tremor investigation task.
This then leads to the next phase of the task, which requires you to find Arish and safely get him from the building.
Once you reach Arish and start to escape, a Hiss ball will block your escape route. Destroy the orb in order to keep on going. Arish then provides you with Level 2 Key Card and therefore Level 2 Security Clearance which lets you enter places that were inaccessible before during the escape.
