Hold fuses to open portal stabiliser holder (pictured)
The fuse machines are devices appearing in Submachine 10: The Exit.
The fuse machines are four large metal canisters ("transmitters") with an antenna on top. This antenna allows the machines to communicate with each other as well as with a fifth canister (the "receiver") that contains a portal stabiliser. The receiver has a simple circular door on the front.
Each of the four fuse machines contains a display of four red lights that light up green every time a fuse is placed inside a vertical cavity on the front.
- Storage unit 33/3 (Royal storage facilities): right loop branch
- Tunnels (Karma studies facility): 2nd tunnel, top room
- Karma studies facility (IIO): Center section
- Meditation temple (III): Left side, lower floor