Hack the sentry terminal (Expert) or pick the security door lock. Open the gate and drop into the old sewer and locate the pipe with a hatch on it. You can use the hazmat suit or Power Armor to handle the radiation. Go underwater to reach Public Works Maintenance Area and use the keypad. Go to Cambridge Neighborhood, west of Greenetech Genetics, and clear out the Raider camp near the river. But first, Preston gives you a holotape to use in the same Institute terminal and also hands you a Laser Musket. The Nuclear OptionДЄfter giving the data from the terminal to Preston, instead of waiting for an attack, you can charge forward and attack the Institute. To complete this quest you need to successfully defend the Castle from the InstituteвЂ™s attack. Once you have 8 settlements you can listen to Radio Freedom, visit the Castle, or speak with Preston Garvey to start this quest. However, if you have 8 or more settlements he will warn you of an incoming attack on the Castle by the Institute and Defend the Castle Minutement side quest begins. He will tell you that the Minutemen arenвЂ™t strong enough to take on the Institute so you must recruit more members and build settlements before an assault can occur. Go and speak with Preston and explain the situation to him. This quest is available after you are kicked out of the Institue for any reason. Continue the quest, you can later come back to the Sturges and give them the data. Use the Network Scanner Holotape and remove the data from the Terminal. Start the Institutionalized main quest and access the Institute Relay terminal or any other terminal you can find. You can get the network scanner holotape from another faction as well. This quest is only available after you help the Sturges build a teleporter during The Molecular Level main quest. Keep your distance and watch the fireworks.

Test the new Artillery Piece by throwing a smoke grenade in the abandoned snack shop outside. Move to the Artillery Piece and press Assign. Pick anyone from the Castle, highlight them and press Command. You need the following items to build it 4x Oil, 11x Gear, 5x Spring, 16x Steel, 4x Concrete, 4x Wood. Locate the button that opens the piston door to reach the exterior courtyard.Д®nter the armory and get the items you need, especially the Artillery Schematic and smoke grenades.Д«uilding an Artillery Piece would be a great help to the Minutemen. Open the Security Door and dress in the attire of the previous Minutemen leader (optional). The defenses must be removed including the Sentry Bot. Go into the Castle tunnels and speak with Ronnie. Shaw tells you of an old Minutemen armory in the western bastion of the Castle. Head over there and meet with Shaw and listen to what he has to say. Speak with Preston after completing a few Recruitment quests and he mentions someone named Ronnie Shaw who is at the Castle. You can find ammo in the CastleвЂ™s interior corridors. You can pick up a magazine near the central radio mast.

How you take the Castle is up to you but focus on clearing the courtyard first. You can do the following to retake the Castle: Meet with members of the Minutemen who want to know your plan of attack. Go to the remains of IvanвЂ™s snack shop outside the Castle, South Boston. Once the Minutemen are set up at the Sanctuary and you completed a few Radiant quests ( Ownership, Recruitment), Preston Garvey wants to retake the Castle. You can keep giving her the chems to hear her visions or use Charisma (Medium) to convince her to go clean. The next time you meet her, she asks you to build her a wooden chair. If you have some, offer her but if you donвЂ™t, find her the chems she needs. When you speak with her, she asks for some Jet. However, to keep them flowing you need to get her some chems and she needs 8 hours of sleep between each intake. Mama Murphy claims she sees visions of the future. Also, build a water purifier, and feed them. Access your workshop and make new beds, furniture inside new or pre-built structures. When Preston Garvey comes to the Sanctuary, they want you to build the Sanctuary. Also, agree to join the Minutemen at the Sanctuary. If there are remaining Raiders, clear them out and meet with Preston for a reward. You will need Fusion Cores to run it but if you donвЂ™t have any, detach its Minigun. On the roof of the museum, you will find an empty T-45 Power Armor. Loot everything in sight, you can pick up Fusion Cores, Vault-Tec Bobblehead, and a classic issue of RobCo FUN! inside the museum. Use the bobby pin or hack the terminal to open the security gate. Once you are done, drop to the ground floor and reach the basement.

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