You just need shelter and safety for the duration of the Nuclear Winter
Beyond that the earth will be washed clean...
In a true Nuclear exchange of large to massive proportions Nuclear Winter will set in, in under 2 weeks...
Most of if not the whole planet is going to freeze
But
within 1-2 years of that time the sub that can pierce through the clous but not escape will cause global warming...also rather rapidly once it builds
up...
So everything gets frozen, all the fallot is going to be locked down... almost everything living in which radiation has entered the food chain,
animals etc... dies...
then it gets hot and it all melts flooding everything and washing it all down stream and out to the oceans, the melting caps will flood 90% of the
worlds cities that have been bombed puttingb them and all those dead zones under the ocean...
it won't take but a few years for those heavy particles to make thierway to the very bottom of the ocean floor... now the irradiated factor being a
fraction of a centimeter from source... or, no worry to us
A 1950 post-bombing study by the aforementioned Committee in Hiroshima examined the regeneration of vegetation in the hypocenter. Here, with help from
the heavy rains a month after the bombings and the open space created by the leveled built environment, vegetation more numerous than pre-bombing was
recorded
This is when the irradiated seeds, not in dead zones sprout... massive rapid overgrowth...
Leave your shelter after 3 years, so long as you were at elevation, so you don't end up underwater, welcome to the garden of eden
People mostly talk of the immeadiate effects of radiation on plant life, but truth be told the irradiated seeds sprung up quite a bounty of mutated
plants outside of impacts sites... plants and mutation works alot faster and tends to be a much higher frequency of useful mutation than organsisms
and seeds can freeze for a few years in most cases thaw and sprout...
all you need is to set yourself up with a very solid shelter, well away from targets... have a well for groundwater built into it, that water will be
fine... radioactive particulates will not reach down in most cases given the short time until the freeze and a stockpile of food...
a few years later you walk out
as a hint, given the nature of storage of food...
Earth Worms... feed them your trash and grow a a couple dozen beds of them... make great burgers ground up...