Instead of worrying about these very unlikely scenarios, I am preparing for more likely disasters. These include the eruption of the Yellowstone supervolcano, a potential gamma ray burst from an exploding nearby supernova, and the likely invasion of Earth by AI robots from the Zeta Reticula constellation.
I can't explain how I intend to prep for these potentialities, because the Zeta Reticulans might already be listening in.