A solar storm unleashes electromagnetic radiation and high-energy charged particles, causing violent disturbances in the upper atmosphere and near-Earth space environment. This will disrupt GPS satellite signals, interfere with high-frequency radio communications, even completely cut off aviation route communications, damage electronic components, and destroy optical systems. … At that point, there will be no phones, computers, internet, Wi-Fi, or even any kind of electrical appliances or power equipment… The entire world will be plunged into darkness. (A pure survival story—no system, no supernatural powers.)