by littlebro » Tue Oct 06, 2020 6:10 am
When going through the mines you must interact with the roof that you see to your right in one of the maps just before you enter the bunker. (If you are in the bunker, and didn't do it, I see no reason why you can't go back and interact with it.)
When you get to Z's bunker, speak to Z. After that you are free to wander around.
Immediately below the entrance into his room is the entrance to another room (Generator Room?). Click on the thing that looks like a container of water. You learn about the minimising solution.
Go to the Life Room. As you walk towards the couple of people standing in the top corridor section of that room, Caius remembers about the roof.
Return to the container in the generator room. As long as you have 2 Angel Winds, the rest happens automatically.