Generally it's better idea to seek cover underground however I do have to applaud your excellent use of some kind of defense and protection.
I am astounded at the news that Ukrainian forces are mounting a furious counter-attack now that Russians have trespass upon land that doesn't belong to them.
Then we have Putin threatening nuclear war...
Absolutely incredible.
Me and my puppy dog wish for peace to come to the world and for this conflict to come to a Swift diplomatic end.
Thank you, I completely agree with you that a bomb shelter is a safe place, but not when forced air circulation systems and power systems from generators have not been preserved there. Many hideouts have been converted into nightclubs, haunts, or simply public restrooms over the years.
Sounds like you could always organize some people and get to building!
It's a shame when you forget the lessons of the past.
Hopefully you will stay safe! Me and puppy dog are sending thoughts and prayers your way