zombie survival game, Project Zomboid, basement mod, detailed underground structure, concrete walls, dim lighting, scattered supplies, wooden shelves, metal pipes, survival gear, canned food, water bottles, crafting table, makeshift bed, eerie atmosphere, musty smell texture, damp floor, cobwebs, 3/4 view, ambient occlusion, realistic textures, survival horror theme, claustrophobic space, limited escape routes, in-game mod, player safe haven, immersive experience, post-apocalyptic setting.