The subway...? That takes me to the industrial district, where I can meet with Leonid to upgrade weapons, but I haven't found another way forward from there. Or am I misunderstanding you?
Hmm...
- We've been to the NSB building twice.
- After the second visit, we convened at an injured person's apartment.
- There, a mysterious contact who helped us during the NSB thing gave us a task to receive a package in the Nightlife District.
That seemed like it'd be a good time to unlock the Nightlife District? or... maybe I misunderstood something, and we're supposed to take the package to the Nightlife District? In which case, where's the package? (This is where a main-quest tracker would be handy, haha...)