I had this idea for an adventure. I wanted to post it here so I don't forget it, and also to share it in case anyone else wants to use parts of this.
~
Players investigate a fatal industrial accident in a mining project by a fault line management agency. They discover that the deceased had uncovered a conspiracy: the agency has been slowly infiltrated at multiple levels by members of the suicide cult NostroCramo. This group believes that the world is a simulation, and seeks to crash the simulation to liberate themselves and anyone else who is trapped in it, and they've become convinced that triggering a massive earthquake will do it.
To do so, they've infiltrated the Seismic Management Division of the Pacifican Department of Geology, which is responsible for conducting deep subterranean operations to execute small controlled releases of energy along fault lines. Their plan has been to use the agency's resources to do the exact opposite purpose: instead of modeling out the safest way to release energy, they've been setting up an energy release meant to trigger the biggest possible release along the entire San Andreas fault line ever: the first magnitude 10+ quake.
The players have to investigate the death, discover that the accident was really a murder, uncover the conspiracy, then make their way through mine shafts to disable the charges. They must work their way all the way to the location of the largest charge in a bunker sitting 7 km down within the earth's crust. They can initially be trying to move undetected to avoid motivating the cultists to trigger the charges early, and then later be racing them down to the last and deepest one.
(I'm calling it "Rock-a-bye Baby" for now, although I'm pretty sure I can do better than that. Feel free to suggest cooler names.)