head right and interact with the broken window about the main door, with no way to reach the ledge above, attempt to open the door to your right. When attempting to open the door, you'll notice a ...

Go hunting for Gore Nests and Secret Keys in Hell.

When you’re ready to leave, approach the main door and use B-12 to unlock it ... Hop up onto the ledge and tap them out of the way until you can get the full view of the code: 3748.