Looks like it happened before. Life is resilient. Unfortunately not even underground bunkers guarantee survival. Still I am confident some of us will survive past that. I could not believe that there was not only the known magnetic pole shift but even the possibility of a crust shift. Unfortunately it looks credible. Well anyway.. it will be what has to be. Even our birth was not guaranteed so it's all taken.
Discussion
It may have.
Perhaps the cycle is inevitable.
We are like ants trying to look at the mountains.
We cannot even perceive that there is a mountain, let alone it's ecosystem.