The Void is not a level. It is what is between the backrooms levels. There is absolutely no escape from here. There is nothing here, just a dark, empty, void.
It has no escape, no entities, no sound, no furnishings, no lights, no food no nothing. You're just trapped, falling forever until you die from starvation, with nowhere to go. This is arguably the most dangerous place in The Backrooms. When falling in the void, you may witness falling past Level 0, you can never enter Level 0 from the void but you may fall past it. Or in extremely rare cases, fall ONTO Level 0.
Entrances & Exits
Entrances
You have a .000005% chance of accidentally entering the void anytime you no-clip through the backrooms. As it is what is between the levels.
There is a .000000000000000075% chance you end up here when first no-clipping into The Backrooms.
There are many ways of getting to this place located throughout the levels.
There are also a few "thin" points in the backrooms where it is easy to no-clip into The void. One of these places is a corner in Level 22 you can run into a corner made from a wall beam jutting out.
Going Through Exit In Level 5050
Exits
Think of an airport, and you will go to Level ∞