Building more nuclear bunkers, or fallout shelters, is not the solution. Popular during the Cold War, they give citizens a false sense of security about the survivability of nuclear war.

In the event of a nuclear attack, it is unlikely that anyone would receive advance warning, so there would be no opportunity to seek cover.

Furthermore, many of the bunkers close to ground zero would become furnaces, killing everyone inside. Indeed, some nuclear weapons are specifically designed to penetrate deep into the earth to destroy bunkers.

Those who did manage to find a bunker in time and survive inside would face a dangerous, radioactive hellscape upon exiting, with slim chances of being rescued.