Bunker

The bunker is an underground locations the author of journals 1, 2, and 3 used as a hideaway. He conducted experiments there and kept the Shape Shifter locked away in a cryogenic stasis until it escaped.

History
The bunker is the secret hideaway the author used to prepare for the end. The end of what, remains unknown.

Appearance
The tree used to enter the bunker is located in the Gravity Falls forest. The bunker can be reached by pulling a branch lever and going down the stairs and are shown in the hole that opens up.

The bunker appears inside first as a small room with weapons, food stock, and Spez Dispensers. After lifting up a poster, There is a small hallway leading to another small room. If you step on the middle tile, the room begins closing in. If you press 4 different symbols, a wall opens and you can then go to an even smaller room with surveillance cameras into a computer. After entering a closet and going through Decontamination, you can enter a new cave, which is vast and doesn't have any known entrances. All it holds is a freezing/shape shifting machine.