If you need a bunker to survive
that, then you're better off dead.
That is, unless you want to be the one eating the last cats and rats and witness what's left of a once 'great' civilisation.
Of course it helps to be prepared for unexpected disasters - natural or accidental - be ready to survive for a couple of days maybe weeks - but if we're talking doomsday - all-out nuclear war, meteor strike or something like that, then death is probably the better option.
After all, we really don't know what's next ! If this life is some sort of simulation (which I personally believe it is), then we will see doomsday .. otherwise it wouldn't be interesting .. we enjoy that it seems ..