The question may feel morbid, but remember that governments maintain continuity-of-operations plans for exactly this scenario - in fact, the Pentagon has spent decades studying electromagnetic pulse effects and FEMA publishes guidance on post-nuclear survival. So, this is not so much speculation dressed as pragmatism as much as pragmatism that most people prefer not to think about.
So let's talk about about it - what happens to tech in a cataclysmic event like a nuclear strike?
The Electromagnetic Pulse Problem
The thing that most people don't think about in scenarios like these is that a nuclear detonation at high altitude generates an electromagnetic pulse that can disable electronics across continental distances. How it does it involves gamma rays ionizing air molecules, which release electrons that cascade into a massive electromagnetic field. A good real example of this is the 1962 Starfish Prime test, a 1.4 megaton warhead detonated 250 miles above the Pacific, which knocked out streetlights in Hawaii nearly 900 miles away and damaged telephone infrastructure across the region - 900 miles impact for a 1.4 megaton warhead; the largest nuclear detonation was a 50 megaton warhead named Tsar Bomba dropped as a test by Russia; that's 35x larger than the Starfish Prime test.
We should keep in mind that modern electronics are far more vulnerable than 1962 hardware. This is because integrated circuits are miniaturized and operate at lower voltages with tighter tolerances. A smartphone contains billions of transistors and each one a potential failure point. In a full-scale nuclear exchange involving multiple high-altitude bursts, the EMP coverage would likely be global or near-global.
What fails: anything connected to the grid or containing unshielded semiconductors. Your phone. Your laptop. Your car's engine control unit. Smart home devices. Medical equipment. The entire internet backbone. Cell towers. Data centers. Instantly, cloud infrastructure becomes irrelevant when there is no cloud.
What survives: devices stored in Faraday cages or bags, which block electromagnetic fields. Simple electronics with discrete components. Older vehicles with minimal computerization, roughly pre-1980. Mechanical systems. Paper.
The Faraday Imperative
A Faraday cage is any conductive enclosure that distributes electromagnetic charge around its exterior rather than allowing it to penetrate. A metal trash can with a tight-fitting lid works. So does a microwave oven, though testing varies. Purpose-built Faraday bags offer more reliable protection for smaller items.
The question is what to put inside. A phone without cell service is still a flashlight, a calculator, a camera, a library if you have loaded books onto it. A tablet offers more screen real estate for maps and reference materials. But the most valuable device might be something like a Mac Mini or compact PC loaded with local AI models.
Consider the utility: a language model that can answer questions about water purification, wound treatment, crop rotation, mechanical repair, radio operation, and thousands of other survival-relevant topics. No internet required. No cloud inference. Just a device with enough storage and a way to power it. Pair it with solar panels and a battery bank, also stored in Faraday protection, and you have an oracle that works when everything else has gone dark.
Communications After Infrastructure
Centralized communications fail completely. Cell towers require grid power and backhaul connections. The internet requires functioning data centers, routing infrastructure, and undersea cables. All of it depends on systems that either get destroyed directly or lose power within days.
What remains: radio. Amateur radio operators have understood this for decades. HF radio signals bounce off the ionosphere and can reach thousands of miles without any infrastructure. VHF and UHF work for shorter ranges. The equipment is relatively simple and can be hardened against EMP.
More exotic options include Bluetooth mesh networks using devices like goTenna or Meshtastic nodes. These create ad-hoc networks between nearby devices, relaying messages across chains of users. Slow, limited range per hop, but resilient. The catch is that the devices themselves must survive the EMP, which means pre-positioning them in shielded storage.
Vehicles and Mobility
Modern vehicles are computers on wheels. Engine control units, transmission controllers, anti-lock brake systems, airbag modules, infotainment systems. A strong EMP likely bricks most of them. Electric vehicles are especially vulnerable given their reliance on battery management systems and motor controllers.
Older vehicles with carburetors and mechanical ignition systems stand a better chance. Diesel engines can run without any electronics at all in their simplest configurations. Motorcycles and small engines offer mobility with fewer failure points. Bicycles require no fuel.
Nuclear Winter and Energy
The detonations themselves are only the beginning. Nuclear winter results from soot and debris lofted into the stratosphere, blocking sunlight for months or years. Studies suggest average global temperatures could drop 10 to 20 degrees Celsius. Growing seasons shorten. Crop yields collapse.
Solar panels, if they survive the EMP, become less efficient under darkened skies. A panel rated for 400 watts in normal conditions might produce 100 watts or less. This is still useful, but energy budgets must account for the reduction. Hydroelectric and wind power remain viable where infrastructure survives, though maintenance becomes challenging without supply chains.
The agricultural implications are severe. Even with seeds and knowledge, reduced sunlight means reduced photosynthesis. Root vegetables, cold-hardy greens, and greenhouse cultivation become essential strategies.
A Preparedness List
For those who want practical guidance rather than abstract analysis, here is a list of technology worth protecting:
- Faraday bags or containers large enough for your priority electronics
- Smartphone and/or tablet loaded with offline maps, reference books, and survival guides
- Compact computer with local AI such as a Mac Mini or NUC with models like Llama or Mistral installed
- Solar panels rated for at least 100 watts, stored shielded with charge controller
- Deep-cycle batteries or lithium iron phosphate packs with appropriate inverters
- Hand-crank and solar radios covering AM, FM, and shortwave bands
- Amateur radio transceiver with spare parts and antenna wire
- Mesh networking devices like Meshtastic nodes, stored shielded
- LED flashlights and lanterns with rechargeable batteries
- Paper maps and reference books as backup to digital resources
- Basic electronics toolkit including multimeter, soldering iron, spare components
- Water purification equipment including filters and UV sterilizers
- Seed stock for cold-hardy and fast-growing vegetables
None of this guarantees survival. It improves odds. The difference between having a working radio and not having one could determine whether you find other survivors or spend months in isolation. The difference between having local AI and not having it could determine whether you remember how to treat an infection or build a water filter.
Preparation is not paranoia. It is acknowledgment that systems fail, sometimes catastrophically. The technology that matters most after collapse is the technology you protected before it happened.
