Just had the thought: Wouldn’t it be cool to have some sort of vent system in the new map? You could press E to enter the vents in certain locations and can move around inside at crouching speed. The mini map would become dark and emphasizes on the vent network. Would give a nice element on surprise!

Edit: When i say vent network, I just mean the 2 or 3 vent entrances, not a whole system