Walkthrough

The Hidden Fragmentation is a fairly short experience, all of the interactions and tasks are optional, so here's a direct B-Line path to The Fragmentation, which is the only requirement to complete the game.

The start of the game puts you in a circle of rubble, leave it, proceed forward and take the elevator to the upper floor. (The elevator has only two stops, you are on the lower one).

Leave the elevator and subsequently the lower floor by taking the stairs out into The Wasteland.

There are multiple ways to enter the complex, this walkthrough will only show the main, intended way to reach the end of the game.

Turn to your left and face the front of the building, there's a boarded up window that can be opened and climbed into.

Once inside, proceed forward into the corridor and down the stairs, get around the broken glass to reach the entrance to a ventilation system, crouch and get inside. (Carefully follow instructions as some paths cannot be reverted and will require you to leave the complex and start anew)

Move further into it until you reach a crossroad, take a right.

Continue traversing the ventilation system up to another split, take a left and proceed.

If you have done this correctly you should find yourself in a larger room with pipes, looking into the storage room.

Leave the room by opening another grate to the left, then another one to the right.

At this point you should be able to stand up and hear a faint wind audio queue.

From this room, enter the hole in the wall and walk forward.

If you have walked far enough, a door should materialize in front of you, enter it, you will be teleported into the tear.

Now enter the run down shack in front of you, open the door and step into it.

 (There are other things to experience in the game, such as a couple of tasks and characters to encounter.)