During the Warmind mission, if you don't pay attention to the direction for the next objective. You could be lead to a broken Darkness zone. Once you have completed the objects (the 2 amplifiers in the Forgotten Shore); Head back along the river/creek (the way you came in for the Forgotten Shore). Now go up the hill and start following the objective arrow. Once in the building (up some stairs, over some rubble etc.). You'll start a Darkness Zone (with or without members in a fire team) in this zone, you will be directed to go further in to the building. You will not meet *ANY* enemies and following the direction will lead you to a dead end (there's a gate that you can't open). You can enter and exit the Darkness Zone as much as you want, there is no change. Even getting another player in your fire team wont make a change.