NUKEMAP: HOW THE NUCLEAR BOMB SIMULATOR WENT VIRAL

The first thing I did with NUKEMAP, sitting in a coffee shop on a Tuesday afternoon in 2014, was drop a Tsar Bomba on the building I was sitting in. Then I dropped one on my parents' house. Then on my old high school. Then on the office I had just quit. The blast radius circles stacked up over the satellite imagery and I stared at them for probably twenty minutes, zooming in and out, trying to make the numbers feel real.

I am not a violent person. I was not having a bad day. I have never had a desire to harm any of the places I just listed. And yet I sat there, drinking a flat white, and conducted a mental nuclear exchange with my own personal geography. If you have used NUKEMAP, you know exactly what I am talking about. If you have not used NUKEMAP, you will do the exact same thing the first time you open it. It is the most consistent user behavior on the internet.

This is the story of a website built by a single nuclear historian that became one of the most used educational tools on the planet, and why a piece of interactive cartography about thermonuclear weapons captured public attention in a way that almost nothing else about nuclear policy has managed to do.

The Wellerstein origin story

Alex Wellerstein launched NUKEMAP in February 2012. He was a historian of science working on a book about nuclear secrecy, and he had been running a blog called Restricted Data where he wrote about the history of the bomb for an audience that mostly consisted of other nuclear policy nerds. He built NUKEMAP as a side project. The original version was a Google Maps mashup with a handful of warhead presets and a calculator that overlaid blast radii on whatever city you searched for. He expected it to be useful for his students and maybe a few other professors teaching the same material.

Within a few weeks the site was getting millions of visits. Not millions over its lifetime. Millions per month. Wellerstein has talked in interviews about being completely blindsided by this. The server costs spiked, the email started piling up, and a tool he had built as a teaching aid for a Cold War history class became, somehow, one of the most viral educational projects on the internet.

The reason it spread is the reason it still spreads. Nuclear weapons are abstract. The numbers are unintelligible. A 1.2 megaton warhead means nothing to a normal human brain. Eighty-eight thousand fatalities means nothing. Those are scoreboard numbers, not lived numbers. NUKEMAP took those abstractions and converted them into a circle on a map you recognize, and that single act of translation is what made the difference.

How it actually works

The core interaction is brutally simple. You pick a location, either by clicking the map or typing a city into the search bar. You pick a weapon from a dropdown that ranges from the smallest tactical warheads (something like the Davy Crockett at 0.02 kilotons) up through the Hiroshima bomb (15 kilotons), modern American and Russian arsenal standards (100 to 800 kilotons), all the way to the Tsar Bomba (50 megatons, which was the largest weapon ever detonated). You can also enter a custom yield in kilotons if you want to model a hypothetical device. You set the burst type, either airburst or surface, and you click detonate.

What you get back is a series of nested circles centered on your chosen ground zero. The innermost circle is the fireball, the actual ball of plasma that forms in the first instant of the detonation. Inside the fireball, everything is vaporized. Around that you get the heavy blast damage radius, where overpressure is high enough to flatten reinforced concrete buildings. Then the moderate blast radius, where most residential structures collapse. Then the thermal radiation radius, which is usually the largest visible circle on the map, representing the area where exposed skin gets third-degree burns from the flash. Each circle has a number attached: how many people are in it, how many casualties the model estimates.

If you turn on the fallout layer, you get an oblong plume drifting downwind from the detonation point, color-coded by radiation dose. You can adjust the wind direction. You can change the time of day, which affects population density estimates because daytime city populations differ from nighttime ones. You can detonate multiple weapons in sequence and see the casualty counts compound.

The math behind all this comes from declassified weapons effects research, primarily the Glasstone and Dolan reference text The Effects of Nuclear Weapons, which is the standard work in the field. Wellerstein built the calculator from those equations and validated it against historical data. The numbers are not perfect, no model of a nuclear detonation can be perfect when most of the empirical data we have comes from two cities in 1945 and a bunch of remote test sites, but they are the best public estimates available.

The thing it taught everyone

Here is what NUKEMAP made obvious to a generation of people who had no business knowing it: most of what you think about nuclear weapons is probably wrong. The Hiroshima bomb, the one that killed somewhere between 70,000 and 140,000 people in a city of 350,000, was tiny by modern standards. Modern strategic warheads are between 7 and 50 times larger. The Tsar Bomba, which the Soviets detonated once in 1961 as a demonstration, was over 3,000 times larger than Hiroshima. None of these numbers mean anything until you see the circles.

When you drop a 100 kiloton modern warhead on Manhattan in NUKEMAP, the fireball alone covers Midtown. The thermal radiation radius extends past the boroughs into New Jersey and Long Island. The estimated fatalities are in the high six figures from a single weapon, and modern arsenals have thousands of these. When you scale up to a Tsar Bomba, the thermal radius extends across multiple states. The visualization is what does the work. You cannot look at it and continue to think of nuclear weapons as just bigger bombs. They are categorically different objects.

That educational payload is what Wellerstein was after, and he has been pretty open in interviews about being conflicted about how the tool actually gets used. The vast majority of NUKEMAP traffic, by his own analysis, is not students or researchers. It is regular people, dropping bombs on their hometowns out of curiosity, fascination, anxiety, or some combination of all three. He has said that this is fine, even good, because the educational message lands either way. You drop a bomb on your house, you see the circles, you understand something you did not understand before. The motive does not really matter. The comprehension is the same.

The morbid curiosity question

I think there is something more interesting going on than morbid curiosity, though that label gets thrown around a lot when people talk about NUKEMAP. Morbid curiosity implies a kind of voyeurism, a fascination with death for its own sake. That is not what most NUKEMAP usage is. What it actually is, I think, is a form of anxiety processing. You take a thing that exists in your life as background dread, the awareness that nuclear weapons exist and could in theory be used at any time, and you turn it into a system you can interact with. You give yourself agency over the thing that has no agency available to ordinary people. You become the bomb's operator instead of its target.

This is the same psychology that drives people to read true crime, to watch documentaries about plane crashes, to obsess over historical disasters. It is not a love of suffering. It is the brain's attempt to gain control over things that are fundamentally outside of control by simulating them, by making them legible, by translating them into something you can hold in your head. Nuclear weapons are the largest ungovernable force most people are aware of, and NUKEMAP is the closest thing to a steering wheel that exists.

The educational value and the anxiety processing value are not really separate. They are the same thing seen from different angles. When you understand the scale of a 1 megaton warhead, you are simultaneously processing a fear and learning a fact. NUKEMAP delivers both because the format demands both.

Nukemap 3D and the spinoffs

Wellerstein eventually built a 3D version called NUKEMAP3D that let you see a mushroom cloud rendered in scale on top of your chosen city. You could orbit around it, see it from street level, get a sense of how tall the cloud column actually was. That tool was harder to maintain because it relied on Google Earth's plugin architecture, which Google deprecated, and the 3D version has had a complicated existence since then. The basic 2D version remains the canonical experience.

There are other tools in the same space, and I've written about most of them in my roundup of nuclear bomb simulator games if you want the full list. Nuclear War Simulator, the indie game by Ivan Stepanov, takes the simulation further into actual gameplay. You manage an arsenal, plan strikes, model retaliation, and watch the casualty counts climb into nine figures over the course of a strategic exchange. It is more complete than NUKEMAP in terms of what it models, and far more disturbing in its implications, because you are not just dropping one bomb on a city. You are running the whole war.

There are also various academic and policy tools, like the Plowshares Foundation's interactive maps and the Federation of American Scientists' nuclear notebook visualizations, which serve a more specialized audience. None of them have the cultural footprint of NUKEMAP, mostly because none of them are as immediate or as easy to use. NUKEMAP is the iPhone of nuclear simulators. It abstracts away the complexity until what is left is the essential interaction: pick a place, pick a yield, see what happens.

Why visualization changes everything

This is the broader point that NUKEMAP makes, beyond the specifics of nuclear weapons. Scale is invisible until you see it. You can read the number 50 megatons all day and it will not affect you. You can be told that a single warhead can incinerate a major city and your brain will file it under "abstract bad thing" and move on. But when you watch a circle eat your neighborhood on a satellite map, something different happens. The fact moves from your prefrontal cortex into your gut. It becomes something you actually know rather than something you have been told.

This is why destruction simulators in general are so compelling, and it is something we think about a lot in the context of Kaiju Protocol, the game we are building at Polylusion. The appeal of stomping through a city as a giant monster is not really about the violence. It is about scale comprehension. You are 300 feet tall. The cars are matchboxes. The buildings are climbable. The people are smaller than your toes. Until you see it from the monster's perspective, you cannot really understand what 300 feet means as a height. Once you do see it, you cannot unsee it. The world's proportions get rewritten in your head.

NUKEMAP and a kaiju game are doing the same essential trick. They are taking something that exists at a scale outside human experience, whether that is a thermonuclear detonation or a Godzilla-sized creature, and they are rendering it in a way your spatial brain can process. The destruction is the medium. The understanding is the message.

The cultural staying power

NUKEMAP launched in 2012. It is now 2026 and it is still getting millions of monthly visits. It has outlasted countless viral websites, weathered the deprecation of multiple Google APIs, survived Wellerstein moving universities, getting tenure, writing his book (Restricted Data, which is excellent), and continuing his actual research career. It is one of the most stable pieces of viral educational infrastructure on the internet.

Part of that is because the underlying topic never stops being relevant. Nuclear weapons did not go away after the Cold War. The arsenal counts are smaller than they were in 1985 but the weapons that remain are more capable, the geopolitical situation is more multipolar and unpredictable than it was during the bipolar standoff, and new nuclear powers keep emerging. Every time there is a flare-up in a region with nuclear weapons, NUKEMAP traffic spikes. People want to know what would happen. They go to the map. They drop the bomb. They see the circle.

Part of it is also that the design is just very good. The tool does one thing. It does it clearly. It does not overload you with options or bury the core interaction under menus. You can be a nuclear physicist or a fourteen-year-old who just heard about the Tsar Bomba on TikTok and the experience is the same. You pick. You click. You see. That radical simplicity is rare and it ages well in a way that most viral websites do not.

The thing I keep coming back to, though, is the educational payload that hides inside the morbid hook. NUKEMAP is the most successful piece of public nuclear education ever made. It has taught more people about the actual physics and effects of nuclear weapons than every textbook and documentary combined, and it did it by accident, by being so compelling that nobody could resist clicking the button. Whatever your relationship to nuclear policy, that is a remarkable achievement. A historian made a thing on the side and ended up with a tool that quietly informs the global conversation about the most destructive weapons humans have ever built. The world is occasionally weird like that, and once in a while the weirdness produces something genuinely useful.