Nuclear power plants have a safety mode. Airplanes can be landed and turned off. ATC can be turned off after the planes have landed. Hospitals would be tricky b

Nuclear power plants have a safety mode. Airplanes can be landed and turned off. ATC can be turned off after the planes have landed. Hospitals would be tricky because some electronic devices do not a manual labor replacement and I think there would be deaths related to a forced blackout. The only thing that I could think of off the top of my mind would be satellites and ships at sea. I will admit, it would be a rough couple of days afterwards as we figured out what survived and what did not. But I don't think it would be catastrophic.