Dive where the bubbles are, turn the 3 valves, press the switch, kill the Milelurk and the Legendary Milelurk, and youre done.\rbr\rbrFallout 4 Thicket Excavations Pull The Plug Thicket Excavations is a quarry Location in Northwestern area of The Commonwealth. It is located to the East of .\rbr\rbrPlaying through the Pull the Plug side-quest in Fallout 4 found at Thicket Excavations. I have to help Sully plug the leaky pipes for a pump. When all is said and .\rbr\rbrThis is the complete Playthrough of the Fallout 4 Mission Pulling the Plug. The mission is triggered after speaking to Sully Mathis at Thicket Excavations.