Level 15

Level 15 is the 16th Level of the Backrooms. It was discovered by Reddit user u/incomplete-sentanc.

Description
Level 15 appears to be futuristic hallways with occasional pitch black areas, along with the sound of an engine in the background, sentanc claimed he went to find the source of the noise but stated that it's hard to find. There is also lights all over with fans right under where you walk. There is occasional Rooms here that each contain one control room. Using these controls does nothing. There is also a discovered computer here. There is thought to be more computers here. This level is completely devoid of entities.

Level 15 is thought to be split into two sections, 1st class, and the lobby. 1st class is the first area you will encounter. It represents a 1st class on a futuristic airplane, though coming across rooms with chairs is incredibly rare, making this area different from a regular 1st class. This area is mostly made up of halls though it is possible to find control rooms here. The lobby is the second area you will find here after wandering far enough from where you started. This area entities are more common, though they don't seem to be that aggressive as usual. Rooms are more common here and occasional cameras can be found on the ceiling occasionally. Furniture is more common here, though it's normally just a single chair. The main "lobby" here has a futuristic table with futuristic chairs. On the table is a computer linked to the cameras in the 5 mile radius.

Log 15: a new group of explorers were sent to level 3, to try to get in here and found a way to enter the level: sometimes there will be rare gray walls in level 3, if you noclip through that wall you may find a door in the end of an hallway, if you open that door you will find 4 more doors, choose the doors in this order: front, right, front, front, left, and you will be sent in here, if you choose a wrong door you will be sent in the starter door room. The wanderer group said they had landed in level 15, they said they found an elevator with 5 buttons, that apparently had random numbers, press one of those, and you would go to one of the main 9.

Colonies and Outposts
There are no known colonies and outposts on this Level, though it is not that hard to set one. (keep in mind that attempting to find communities in any Level is not recommended, as the Backrooms are infinite, and the community could be dangerous)

Entrances
Level 15 is extremely hard to get in to. Sentanc claims that he opened thousands of doors in Level 3 and then one led here.

Exits
The only known ways to leave is to noclip into one of the Negative Levels or find an exit door and go to Level 16.