Unlock trap door is an objective in Borderlands 3 (Borderlands3).

Unlock trap door is an objective in the Story Mission, Lair of the Harpy in Borderlands 3


  • In the projection booth, after the looting, go to the front middle where you can see the control panel.
  • On the ground just in front of the control panel is the clue to the puzzle you need to solve.
  • Begin by pressing the button on the right-hand side of the control panel to begin the puzzle.
  • There are 3 pull levers that are used: Left, Center, and Right. Each have 3 props attached to them.
    • The Right Lever (right prop): Jakobs,
    • The Middle Lever (background): Ruins, Jungle, Pandora
    • The Left Lever: Psycho, Typhon DeLeon
  • The solution is to have the Typhon DeLeon, Ruins background (V-shaped ravine in middle), and Vault Arch.
  • Have this pre-set in place then go back to the button you started this puzzle with.
  • Press it to open a trap door in the middle of the stage.