The world has been dead for thousands of years… Or so the ark survivors thought. Hundreds of thousands of survivors were sealed below the surface of the planet, on all the continents, in an effort to save humanity from the coming calamity. It was the only option.

You awake to the sounds of a repeating transmission interspersed with static
“Warning static danger static surface static alien silence”
It takes you several minutes to recognise the words. The cryo-display shows that it has been over 600,000 years since you were sealed away. The ark is damaged beyond repair, and only a small number of stasis chambers seem to have survived.

The central computer display shows you a map, which you manage to transfer to a portable display device, before it fails. You wonder what the hell has happened