Thank GOd I did not fill in the bomb shelter. All I have to do is take out the stuff I put in storage 20 years ago, clean out the leaves and, perhaps, replace the canned food.
What’s interesting is that if your fallout shelter is dug into the ground (at least ten feet under) and contains a decent way to seal out contanminants, you could survive a near-miss from a 1 MT nuclear bomb (though ground zero has to be around 1.75 miles away) and live there safely for up to 2-3 weeks with enough consumables such a water and canned food. Mind you, those shelters now find better use as tornado shelters in the US Midwest.