Hey all. I have a few scenarios of what possibly happened to the humans after the "Great Plague" (The event that the cave art with the microorganisms shows).
Scenario 1- Underground Monastery-like habitats/Cyborg Monks.
Other humans realizing the plague could wipe out their race decided to live in deep underground habitats. The humans slowly began to modify their bodies to become more cyborg-like to extend their lifespan and also became more monastic as time went on, collecting the lost relics and knowledge of their once great race. The humans regard their treasures as Holy Relics and worship technology believing that they could soon shed their organic body and become truly artificial beings. They also feel once they are ready they shall rise up once more and regain their land on Earth.
These humans would look something like this
http://fc04.deviantart.com/fs17/f/2007/220/b/3/Adeptus_Mechanicus_by_FirstKeeper.jpgSceneario 2- Complete Extinction
The Humans were all killed before they could evacuate the planet leaving only their technology behind.
Scenario 3- Cryogenic hibernation.
The humans who were lucky enough to escape the plague were people who had frozen themselves in hope that someone in the future would unfreeze them. This fad of Cryogenics went into it's height before the plague hit so there are a large number of frozen humans waiting for the day they would be thawed out to start their lives anew.
So tell me what you all think of my ideas.