There's a hole in the wall located on the 2nd floor, northwest side of the Ministry building which you can jump through and potentially go off the playable zone. Certainly fall to your death and see things no player was meant to see. Found it while playing in coop Checkpoint, no idea if it's there on Push or some of the other PvE/PvP modes.
In the image below, it's at the location of the two player blips furthest to the top left at grid D-2.
Video demonstration: