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Kurzgesagt – In a Nutshell - What if We Nuke a City?

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Author: Kurzgesagt – In a Nutshell
Categories: History
Tags: history
Views: 2 · Last viewed: 2026-10-16 00:54 UTC

Short Summary

Main recommendation: The video argues for eliminating all nuclear weapons and never building them again, because no nation can meaningfully help the victims of a nuclear explosion. The video, made with the Red Cross and Red Crescent movement, walks through the three phases of a single detonation in a major city to show why. It argues that the weapons themselves are the problem, not which country holds them.

Key Points

  • The first phase is near-instant: a fireball hotter than the Sun, more than 2 km across, vaporizes nearly everything within it, and the flash can blind anyone facing the blast for hours.
  • The thermal pulse ignites combustible material up to 13 km away, across roughly 500 square kilometres, so people many kilometres out can go from commuting to burning in a moment.
  • The shockwave, faster than sound and stronger than hurricanes, collapses buildings within a kilometre and flattens about 175 square kilometres of houses, while people up to 21 km away may be injured by flying glass.
  • The aftermath is a combined catastrophe: hospitals are likely destroyed, roads and infrastructure are blocked, radioactive black rain falls, and aid cannot quickly reach the zone, so survivors are largely on their own.
  • Long-term harm continues for weeks, months and years, with many survivors later dying of cancers such as leukemia.
  • In 2017, almost two-thirds of the world's countries, backed by civil society and the Red Cross and Red Crescent movement, agreed to prohibit and eliminate nuclear weapons.

Details Worth Noting

  • Concrete instructions: The video gives one actionable step: visit notonukes.org to learn more about nuclear weapons and what you can do about them. It does not list personal preparation steps, and it states that after a nuclear attack, survivors are on their own.
  • Steel-reinforced concrete buildings were the only structures that partially resisted the shockwave pressure near the blast.
  • Survivors in metro tunnels or sheltered positions may still face radiation exposure, and people receiving the highest doses are expected to die over the following days.
  • The video notes that Red Cross help is limited: surrounding cities struggle to enter the zone, and radioactive contamination makes approaching the area risky.
  • The speaker says many experts believe the current danger of a nuclear strike is higher than it has been in decades, citing world leaders publicly threatening each other with nuclear weapons.

Bottom Line

A single nuclear detonation in a city would produce a disaster no current government or relief system could handle, so the video's case rests on eliminating the weapons entirely rather than managing them.