10,981 BCE. INVASION of EARTH!
We didn’t see them coming.
They hit us hard from Space. Brutally hard.
It took them about twenty hours to attack and defeat Earth’s defenses, so the war was over at that point, technically anyway, but it took the Invaders another thousand years to mop up residual problems.
The attack was coordinated to be simultaneous on both hemisphere’s of the planet. The central hub of Earth’s planetary civilization located in the Southern hemisphere was destroyed, it’s infrastructure in shambles, it’s population damaged, and in shock, rocked by the ferocity of the attack, never to recover. All they could do was to flee the ruins. Most of the refugees, tens of millions, perished in the attempt...." Click for clif high's full article
We will be hearing much more about inner earth civilisations.