post-apocalyptic setting, underground metro, dimly lit tunnels, gas mask, military-grade armor, makeshift weapons, eerie shadows, mutant creatures, abandoned train cars, rusted metal textures, damp concrete structures, flickering lights, survival action, scavenging for resources, stealth gameplay, atmospheric tension, claustrophobic environment, first-person perspective, detailed character model, immersive sound design, 4A Games, DLC content, enhanced graphics, expanded storyline, additional missions, character special abilities, atmospheric filters, high-resolution textures, dynamic lighting, ray tracing, survival horror elements, limited ammunition, tactical combat, exploration of the Russian metro system.