a partially narrated guide maybe not a map.

Deep Black Darkness is NOT the absence of light.

Darkness is what's constructed and dealt and traded by corporate executives (ENCT North anybody??)
That's why the alleys are full of darkness all the time. But why would the benevolent but ungenerous city council spend resources on darkening alleys? (serious question)

It's because only really meaningful experiences happen in dark alleys. That's why they're more important than schools: taking you out of your comfort zone. Everybody has got a dark alley story. That's intentional. There's not good or bad ones just meaningful ones.