If those things will happen if it will be really global then bitcoin price will be last to be worry about
That's for sure. If a global catastrophe happens, it will put people on the brink of survival. At the same time, the Internet will probably disappear, and with it the cryptocurrency will disappear. Of course, in such a situation, the cryptocurrency will simply be forgotten.
Even if the Internet still works for some time, people will be afraid that it may disappear and the cryptocurrency will practically depreciate. Even if the threat of the disappearance of the Internet is not, which is unlikely, vseravno with a global catastrophe, the liquidity of the cryptocurrency will drop sharply, products and essentials will be valued.