1) this fortification is just a general speaking of the battlefield fortification, does not have the ability to protect the nuclear, this time mp3, computers and other civilian equipment at a certain distance from the center of the nuclear explosion, even if not turned on after the nuclear explosion. equipment at a certain distance from the center of the nuclear explosion under the conditions of even if you do not turn on the nuclear explosion after the experience is not possible to use again, the hard disk can not be used, this is mainly because of the nuclear magnetic impulse induction to the circuit, the formation of high voltage in the circuit between the breakdown of the electronic components or burned off the circuit wiring (nowadays electronic circuits are even more so, because of the wiring is more fine and more dense). The United States on July 8, 1962, the United States in Johnston Island over 400 kilometers above the nuclear test, the result is more than 1,300 kilometers away from the heart of the storm on the island of Hawaii, hundreds of burglar alarms ringing by mistake, dozens of streets street lamps fail, short-wave communications interruptions, radar screen highlights failures, the power supply system fuses burned out, the electrical components burned out, the insulation was penetrated, the electronic system storage flushed out, the program is chaotic, the wireless control equipment shutdowns, alarm message control failures. The details of these phenomena you can search on the Internet.
2) If the fortification had been nuclear-protected, the result would have been exactly the opposite, and almost all equipment would have been usable after a nuclear explosion. I don't want to give examples about the technical aspects of nuclear protected fortifications, you'll find a lot of good examples on the internet. I would like to introduce the importance that Switzerland attaches to nuclear protection. Switzerland stipulates that every family should have a space for nuclear protection, with a certain amount of water and food stored, and at the same time, this protective space has the capability of electronic protection and radiation protection. If your family doesn't have so much money to build such a space, a group or a community should raise funds to build it, and the government should give certain subsidies, which are worthy of our reference, and these are worthwhile. Switzerland can not only be called the national defense of all people, can be called the national defense of all people, in peace and security.
For the EMP bomb, you said the metal bunker should have some protection, because the EMP bomb belongs to the high-frequency high-energy EMP, this bunker any external contact electrical interface should have the corresponding EMP suppressor (arrestor), to prevent the electromagnetic energy through these ways to enter the bunker, resulting in harm to the infallibility.
Nuclear EMP is a very good subject, worth studying, if you are interested again, you can watch the John Woo director's Broken Arrow (Broken Arrow), where there is a paragraph about NEMP, after the underground nuclear explosion, the helicopter itself will fall, that the villain also made a sentence of explanation.