How to unlock: The quest will start automatically after completing the Blind Betrayal quest.
- Speak to Lancer-Captain Kells
- Enter Old North Church
- Kill Doctor Carrington
- Breach the Door to the Lower Levels
- Kill Glory
- Kill Tinker Tom
- Kill Deacon
- Kill Desdemona
- Reprogram P.A.M or Destroy P.A.M.
- Report to Lancer-Captain Kells
Walk inside the Old North Church
The Tactical thinking quest will start automatically after completing the Blind Betrayal quest. In order to learn more about your objective, you must go to Lancer-Captain Kells who can be found on the Prydwen ship. Before getting rid of the Institute you must destroy the Railroad.
Your first step should be going to Old North Church which is located slightly to the west from the Prydwen ship. Enter inside the building and you will immediately notice a battle between members of the Brotherhood and the Railroad. You must get rid of all enemies, and most importantly of doctor Carrington.
Walk to the basement after winning the duel and then walk ahead through the tunnels, defeating enemies on your way. Luckily, the members of the Brotherhood of Steel will keep helping you. Activate the detonator at the end of the tunnel and walk to safe distance. The door will be blown up.
Kill the members of the Railroad
Once the door is destroyed, you will receive few new objectives. You must kill the most important members of the organization - Gloria, Tinker Tom, Deacon and Desdemona. Keep going ahead and enter Railroad H.Q. You will immediately have to face few stronger enemies. Watch out especially for Gloria who has a minigun. Using the grenades when enemies are close to each other is a good idea.
Reprogram or destroy PAM
Walk to the room on the left. There you will find the robot and a terminal. You now have two options. You can simply destroy the robot or use the computer and load the P.A.M. Decryption Program tape. Your choice won't impact the quest. Now go back to Prydwen ship and talk to lancer-captain Kells. The quest will end.
Quest rewards: Experience points.