If If we went into a nuclear winter then their would be a worldwide famine, and a screwed up ozone layer. Our oceans would also decrease in temperature. Most people would die due to starvation, but if were lucky, then we could survive.
If nuclear war broke out then you would need a safe place. Antarctica would be safe since places have already agreed to no nuclear detonation their, so that it could be used for research. The Easter Islands would also be a great spot, because their are no major cities or reasons to bomb it.
A nuclear holocaust or nuclear apocalypse is a theoretical scenario involving widespread destruction and radioactive fallout causing the collapse of civilization, through the use of nuclear weapons. under such a scenario, some of the Earth is made uninhabitable by nuclear warfare in future world wars. Most current electronics would be destroyed due to the electro magnetic pulse. Many people would starve due to famine, die of radiation sickness, or die fighting over food.
If one hundred atomic bombs were detonated then the world would go into a nuclear war. In the event of a nuclear war, the entire world would get a little colder, this may not seem like much, but this would cause worldwide famine, plus the radiation from the blast zones would be very harmful also. This simulation was with 100 atomic bombs, the type that was dropped on nagasaki. If 5 nuclear warheads were dropped, the kind we have today, then we would go into a nuclear winter