Doing the gate keeper quest. On Venus when you have to scan the conflux, go to your left and follow the bridge. Kill the two axis minotaurs. Behind then there is a hallway that leads to a dlc area that isn't complete. Once you get to the back, there's a gravlift. You can climb up the side of the wall to the left of it then jump inside the gravlift. Takes you to the unfinished dlc. If you get those two ghosts though, I heard you can get banned so I stopped going up there