Slowly inch forward. You will hear your footsteps change from stone to metal. Follow the particle trail for 15 meters until you hit a wall that wasn't there before.
Ignore the obvious door leading forward. Instead, look at the shattered stained-glass window depicting a saint. Normal windows are just textures. This one, however, has a visible crack that you can walk through. Use a grenade or rocket launcher to blow the remaining glass away. zombie shooter 2 secret locations high quality
The gap is actually an invisible bridge . You need to walk off the edge onto thin air. The fog effects in Zombie Shooter 2 obscure this, but if you look closely (again, high-quality rendering helps here), you can see faint shimmering particles in a straight line. Slowly inch forward
This is not a wall you break. This is a logic secret. You arrive at a locked military armory door. The console says "Access Denied: Critical Power Failure." Ignore the obvious door leading forward
Most players rush through the initial sewer level, fighting off the standard green mutants. However, early in the level, after you drop down into the main water channel, look at the minimap. You will see a thin grey line leading off to the left that seems to go nowhere.