So in the final room, it's kinda like door 100 in doors, but still different.

In the room, there's a warm area, which is good considering everything outside the warm area is very cold. Due to it being so cold, the frost won't go away if you move, but if you take a break in the hot room you can warm up, meaning you can only spend limited time outside the warm room.

The objective is to get to all 4 th3rmal diverters, which get activated by standing by them for a bit. When one goes green it gets activated. You have to do that to all 4 which powers up the Terminal (Big machine with the 4 red or green lights on it (lights go green as you activate diverters)), and when all 4 are active, you go back to the terminal and complete a minigame where you have to press buttons on your keyboard to fill up a bar, which when filled will open the main doors letting you leave.

This will all happen wh1le Thawn roams the cold area, which isn't an instant kill, but they scram you, making you bleed, which still will eventually kill you.