why cant i make my game pitch black darkness?

im trying to make a horror fps game with unity but i dont know how to get total darkness at the the moment if i have no light and im in a room i can still see perfectly which i dont want.

so can anyone tell me if theres any way of getting total darkness?

You need to turn down the Ambient light in the Render Settings. Also, make sure you're not using any self illuminated shaders.