Going on 2 hours down now....
2 things:
1. 2+ hours seems like an incredibly long time to clear a false fire alarm
2. Who was the idiot who thought it was a good idea to have the only 2 rides in a $0.5 billion land share a ride building? Operationally there would be no benefit. The only benefit I can think of is maybe a slight lowering of summer energy bills since each building has 1 less outside wall area since they are joined together. Everything thing else is negative, as we are seeing right now with both rides having to be down at the same time due to a fire alarm issue in one of the buildings.
Given that I have a very hard-fought FP+ for FoP tonight I hope they get this cleared up soon.
I'm a fire protection engineer so I have some insight on this stuff in general (but nothing specific for Pandora). For being part of the same building, it makes sense from a building code, cost, and convenience viewpoint. If there were 2 separate buildings they would need to be separated by a certain distance or rated walls, with limited openings between them. I'm not sure the exact layout of the rides and mechanics, but I could see them utilizing space above or below one of the rides to fit in the equipment for the other ride. For cost, it is much much cheaper to just create one fire alarm, fire protection, smoke control, HVAC, lighting, etc system that is sized for one larger building than two separate systems sized for two slightly smaller buildings. From what we hear, the bean counters cut costs on Pandora, so this could be a way that they were able to spend more money on the actual rides and land vs the infrastructure.
For the fire alarm system, I am surprised that a false alarm could cause the whole building to evacuate. I would have expected some sort of pre-alert system, where the security office gets an alert that an alarm has been triggered and the exact location; that way a guard can be sent to check it out. If it is a false alarm, they can reset it without guests being aware (or at least just a temporary halt to the ride). If it is a real alarm, then either the full fire alarm can be set off and people will be evacuated, or if its not a dire emergency, CMs can evacuate people in smaller groups to prevent a panic. That is similar to stadiums and large assembly venues.
Now, for these rides I am suspicious that maybe something set off the fire protection system (i.e. automatic sprinklers). If one of those was set off, even in a backstage area of the building, then the building would need to be evacuated. The fire alarm would sound automatically, as when the fire protection system activates it is assumed that there really is a fire vs a false alarm from a fire alarm device. The building would not be able to be occupied until the entire structure (all rooms, including closets, offices, etc) is again protected with the sprinkler system. That would mean the device that set off the sprinklers would need to be replaced and the system re-initiated. That does take time. And if a sprinkler did go off, there is a certain amount of clean-up needed (fire sprinkler water is disgusting-think water that has been sitting in pipes for probably years so it is black and smelly).
And, in case people are curious, when sprinklers go off, it is nothing like the movies. First, you will have one, maybe two sprinklers go off (they activate based on the temperature of the hot gases in their exact area), but all sprinklers are connected to the same piping system, so even if only one head activates, the water in the entire system may get released in that one area, unless you can turn off the water supply first. Second-sprinkler heads can be set off from heat, but also from impact; a lot of heads are designed with a glass bulb that is blocking the water within the pipes. Within that bulb is a certain fluid which expands when heated (like mercury in a thermometer), once it reaches a certain temperature it will cause the glass to break and water to come out of the opening. But if you hit the head, with say a ladder, it could also break the bulb and cause the sprinkler to go off.
So, sorry for the long post! And again, these are just my thoughts-no actual knowledge about the situation!