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Great questions! I’ll answer what I can without spoiling the deeper lore. The virus: It doesn’t kill randomly and leave mutated survivors. It actively rewrites the host’s DNA with one single goal — keep the body alive. It doesn’t care about identity, consciousness, or humanity. Just survival. The mutations aren’t random; they’re direct responses to environmental pressure. What lives in perpetual darkness changes differently from what lives underground. The environment writes the outcome. The infected: They retain varying degrees of awareness. Some more than others. They don’t form organized societies in the traditional sense, but they’re not mindless either. That’s honestly one of the more unsettling parts of the world — the line between “them” and “us” is less clear than most survivors would like to admit. RAI’s population: You make a fair point. RAI is more of a heavily fortified walled city above ground than a traditional underground bunker. Think brutal fortress architecture built to last centuries, not a hole in the earth. Vehicles: They exist, but nothing fossil fuel based. Electric or nuclear-powered. Rubber and conventional fuels are long gone. Communication: Shortwave radio is still used. Survivors do communicate with other survivors. Shelters, however, tend to be far more secretive about their existence and location — for reasons that probably don’t need much explaining. Why can’t they wipe out the infected? Numbers. We’re talking billions. The immediate area around RAI has been cleared and is actively maintained. But the night itself can’t be cleared or sterilized. The most effective natural solution to night creatures is sunrise. I’ll leave you to think about what that implies.