video game, Atomic Heart, secret lab, hidden documents, futuristic technology, mysterious artifacts, Soviet setting, abandoned facility, eerie atmosphere, dim lighting, rusted machinery, overgrown vegetation, scattered papers, glowing terminals, locked safes, covert experiments, robotic parts, genetic modifications, surveillance cameras, leaking pipes, concrete walls, steel doors, atmospheric shadows, first-person perspective, immersive exploration, tense soundtrack, environmental storytelling, high-resolution textures, advanced particle effects, dynamic lighting, ray tracing reflections.