Natural disasters and war have been felt several times by Bitcoin users, for example: flood disasters in India and Pakistan a few months ago and the war that occurred in Ukraine and Russia as well as in the Middle East, That's just a few countries that experience natural disasters or war, not to mention other countries, but for now they still have bitcoin and are still active in the crypto market.

For me, the phenomenon of disaster or war is worried about losing Bitcoin, if loss of internet access is what needs to be worried, maybe if it happens, most likely access to Bitcoin cannot and Bitcoin will disappear.

Disaster and war while you still keep the key for Bitcoin access I think you are safe.