Seriously, you guys ? Hmm. What is going to happen is not the issue. As a Muslim, I believe in our faith. Faith of Islam. Day of Judgement. Yaumul Qiyamah. It's all have been written and if it is meant to happen (on that moment), it is meant to happen for He utters "Be" and it is. There will be no such terms as survivors left to repopulate civilization and so on.
And more, there will be no such FAQ to answer your insane questionnaires on fighting or post-doomsday thingy and all. It's the END OF DAY. The End! Keep holding on to our faith (Imaan), insyaAllah, you'll be safe as promised by Allah SWT.
The Prophet Muhammad SAW said: "Faith wears out in the heart of any one of you just as clothes wear out, so ask Allah to renew the faith in your hearts" (Mustadrak al-Haakim).