After the big cataclysms, most of the city was destroyed and the residents were driven ground. Only well-armed people come to the surface in search of necessary resources, for which they must battle. Try to survive and get the necessary resources.
Control keys:
F - Pick up weapons, ammo
1,2,3 ... Change weapons
WASD - Character movement
SPACEBAR - Jump
SHIFT - Sprint
Esc - Exit to the menu
LKM - Shoot