Chapter 10: The Dark Sector is the tenth and last chapter of the game Dark Sector, and the titular chapter. The tenth chapter is very brief, consisting of just two fights against regular enemies and then the final battle against Mezner. After the incident at the tracks leading into the Vault, kill the enemy soldiers. Use the shift ability to sneak behind them more easily. In front of the Vault's main gate, climb the ladder up to the control booth. Press the switch in the booth to open the gate. If Hayden defeats Mezner, congratulations on finishing the game, and enjoy the ending.