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Upon entering the Burrows, recover the holotape from the Brotherhood corpse directly ahead. After listening to it, proceed into the sewer tunnels, with the objective being to reach the control room in the pump station. Be prepared, as the tunnels are crawling with gangrenous and charred feral ghouls. There are several crafting stations along the way to scrap any junk collected as well. An automated turret has to be dealt with before being able to pass into the area of the Burrows where the Burrow Boys set up their main camp.
Upon reaching the jail cell door leading into the old sewers, a key is needed to unlock it. Read the note next to the corpse by the door to be directed to the throne room where the key can be found. Once past the gate, deal with more feral ghouls as the path has to occasionally divert from the main tunnel due to cave-ins until reaching the mag-locked door to the pump station. Read the entry on the terminal about maintenance and follow the nearby tunnel to the end where the valve is located with a skeleton and two mole rat corpses. Turn the valve, but prepare to be ambushed by three more feral ghouls in the process. Head back to the door, and check the terminal again to find an option to unlock the door. If the door locks before getting through, go back and turn the valve again to enable the ability to unlock it again.
Head into the pump station, but be prepared to now deal with Mister Gutsy and Protectron robots in the pump station. If unable to hack the terminal next to the mag-locked doors to the control room, use the catwalks to find an alternate route in via a back door. Once in the control room, watch out for the automated machine gun turrets on the walls while focusing on the Assaultron boss. The turrets can be deactivated by hacking a Level 3 terminal in the room overseeing the control room. Once the Assaultron is eliminated, the quest completes, awarding The Gutter and other various rewards.