When you return to the corridor with the capsules head back to the Sanctuary exit, but this time to the door on the right, which leads to a small staircase. Go up the stairs and when you reach the new location, interact with the piano from the above picture. This action will lead to the appearance of a type of elevator. Enter it in order to be transported to the Chiron Hotel.
Note - You will not be able to use any of the alternate modes of vision while playing out the final scenes, which have been described below. Fortunately, you will not have to find any evidence or traces, so you should be able to handle these sequences without any problems.
Go down the corridor to the desktop where you have enter into an interaction (next to it you will also find a new collectable photo). Take advantage of the green door and move on. In one of the adjacent corridors, you will encounter a corpse that you can investigate or ignore. You can also press the button by the red door and listen to a conversation.
Resume the journey and explore the other corridors until you reach the cell-like room. There is a new collectable photo here. After taking it use the side passage and continue on, then squeeze through the first ventilation shaft.
The problems start when you get to the exit from the shaft as shown in the picture above, since a mutant that is already known to you is traveling around the area and being detected by him results in your immediate death. In this location as well as in the next two, you must sneak around in order to avoid drawing the attention of this opponent.
Note - Remember to not attempt to get up, because you can then be easily heard by the mutant. Always move in a crouched position. Fortunately, this will not be too difficult, as the monster moves around slowly and will give you plenty of time to complete all the activities required in order to effectively evade him.
It would be ideal to spend some time getting to know the mutant's travel route. He patrols corridors that make up a rectangle and always goes in the same direction. This means that you can carefully start following him. Do not come too close to the mutant, because in at least one location he can suddenly look back for a moment.
Interestingly, on your way you will encounter hatches, which are leading to other ventilation shafts, but you do not have to use them since it is simply sufficient to follow the mutant while keeping a safe distance from it. Continue this process until you reach the corridor shown in the image, which leads to the next location.
Walk through the consecutive corridors and ventilation shafts to reach the second area with a mutant. Here the opponent also travels down corridors in a large rectangle pattern. Wait in hiding until the monster moves to the right and as before begin to slowly sneak up on him. You can follow the opponent directly or bypass him by taking parallel corridors. There is also another opportunity to use the side ventilation shafts here, but you do not have to rely on them. The exit from this area is presented in picture 1.
Explore the corridors, remember to move in the crouching position. Thanks to this you will not be detected prematurely by the mutant from the third larger location, which you are just about to enter. Use the monster's slow movements again and sneak while being a safe distance behind him or go along alternative corridors. The exit from this area is shown in picture 2.
After a few moments you will reach a much longer corridor leading to the computer room. Interact with the computer and just after watching the scene behind the glass wall, turn around and start your escape. During this scene you cannot allow your hero to be caught by a huge mutated creature, but luckily for you it will not be able to move too fast. In addition, in some further locations the game will allow you to look around, only you will not be able to return to areas you passed through earlier.
Take advantage of the consecutive corridors and ventilation shafts during the escape. On the way you can also find a new collectible photo. In the location shown in the picture above, detach the cables to unlock another passage. In one of the following areas you will have to locate handles that you can interact with.
More narrow passages will soon lead you to a new, slightly larger location. Explore the area on the right and look at the two obstacles shown above. Just as before, you need to use the white handles that you can interact with and use them to move the larger objects to the right.
Continue your journey. More corridors will lead you to the elevator door. Press the button and do not worry about being caught by a huge, mutated mass soon because there is a fully directed cutscene. After a while you will advance to the ultimate finale of the game.