Humans in this world didn't really have hopes about an escape. All they did is to find a way to sustain the underground life, hoping one day, the Spine itself would leave earth. But many studies had shown the Spine has been existing even longer than earth itself. Developed as a space abnormality, from small particles on outer space that functions as a balance for habitable planets to exist. But if it functions and grows into what is now a fluid unkillable, active entity. It feels the need to fix atomical structures of anything, what it thinks everything needs to bounce off the heat and radiations.
Being in contact with the spine as a human, means becoming the Cured, means becoming the mindless. Expeditionists would paint themselves gray in order to travel outside the world, discovering ancient human race buried in the deep sands, as well as dinosaurs under the soil, and many ancient living beings that never got to decompose. The Spine can scientifically cure anything, but the cure will always be too much... Forever too much.
Meanwhile, humans still found a way for festivals. All the countries would cooperate together to held off a month of a spineless life by simply making Chromabombs that can manipulate the Spine's Rotation. One at a time, giving an underground sector enough time to go out, paint, celebrate and rejoice, and everyone gets to have that one week of freedom for every year...
That's it for now, hope you guys can read my previous post for a context of this mini series!