Thicket Excavations

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Thicket Excavations is a quarry located in the northwest the Commonwealth in 2287.


This quarry has a reputation across the Commonwealth for producing the finest mirelurk meat due to the waters giving it a better flavor.[1]


A fenced in quarry area that has been flooded, it is found to have scatters of cut stone around it. There are stairways leading up the north side of the quarry and a sloped ramp that extends into the water. The top level on the east side includes an elevator as well as a camper in which Sully Mathis's terminal can be found which details his plans for restoring the quarry for use as a base. There are several campers spread out around the nearby area.

If the water is drained from the quarry during Pull the Plug, 24 hours have passed and one has reached level 12[2], then Sully will then (when the Sole Survivor next returns) be found to have brought in his gang of raiders, and these hostile raiders will be found spread out throughout the quarry. Sully Mathis will now be found to be much more powerful - minimum level 30 - and like the raiders will henceforth be implacably hostile regardless of any prior help he was given. Three mirelurk pens will also be found in the area.

Notable lootEdit

  • Taboo Tattoos issue #2 - In a metal trailer caravan (the one closest to the excavation area) on the south side of the excavation area and directly southwest of the water pump.
  • Sully's journal - Holotape in the east trailer inside of a terminal.

Related questsEdit

  • Pull the Plug - Sully Mathis will ask for help to repair the pipes of the water pump and empty the quarry of the irradiated water. After completing the quest and 24 hours have passed (with the player outside the map zone and needs to be at least Level 12), Sully Mathis will be hostile, and be the leader of a raider gang which he initially commented about doing in his terminal entries. However, if he is killed immediately after the end of the quest, that will be that.
  • Raider Troubles - Once Pull the Plug has been completed, troublesome raiders might take refuge at this location between two attacks on the Commonwealth settlers.
  • Quartermastery - This is one of the many locations Scribe Haylen will send the Sole Survivor to recover a piece of technology.


  • There is a chemistry station half-way down towards the bottom of the excavation area. It is in a little shed.
  • When you reach the mid-section of the bottom of the quarry, you will find a weapons workbench.
  • If you have the Aquaboy/Aquagirl perk, you may find some very minor loot underwater before completing the quest. The content of the underwater containers will re-spawn after completing the quest Pull the Plug.
  • The Thicket Excavations' Raider Camp respawns accordingly to the level of the Sole Survivor as well as the containers at the surface/bottom of the area, but Sully Mathis has a minimum level of 30. The trunk at the bottom does not respawn though, until Thicket Excavations has been drained.
  • While the quarry is flooded, the elevator will not function from the surface. But even if you have power armor, you may not drown if you dive in (depending on where exactly you stand or swim); but you will immediately sink to the bottom of the quarry, unable to 'swim' back up. You can walk around, potentially finding a route using stairways and platforms to make a return to the surface. You can also reactivate the elevator by pressing the button right at the bottom. However keep in mind that wandering along the bottom of the quarry will be very time consuming compared to swimming around and repairing the pipes without power armor. Note: If you do wind up at the bottom in power armor, it may just be better to leave and then come back when it's drained. So long as the fusion core is removed and you return speedily enough it will still be there.
  • Attempting to place mines after completing Pull the Plug but before the quarry has drained will not work, in the sense that the mines will all disappear when the quarry "respawns" in its drained form.


Thicket Excavations only appears in Fallout 4.


  • pcIcon pc Upon arrival at Thicket Excavation there seems to be a foglike low-res concrete-floor, hovering above most of the real surfaces, and it persists under water. It is the high distance version of the model (aka LOD) you should only see when the object is very far away. This manifests in that both the Sole Survivor and Sully Mathis wade knee deep in concrete, Sully always hovers around the compressor/pump, before the Sole Survivor suddenly falls into the water or the access-way leading down into the excavation. The impact of this bug can be negated by restarting the game. [verified]
  • pcIcon pc ps4Icon ps4 If you swim underwater to enter the excavation site before draining it, you will fall down to the floor and be able to walk and shoot your gun under water. In some cases Dogmeat may also teleport down to you and swim in place as he tries to follow you.[verified]
  • xboxoneIcon xboxone If you swim around enough before draining the quarry it is possible to cause the quarry to instantaneously empty of water and update the world/quest state such that the previously mentioned enemies (raiders, mirelurks) appear.[verification overdue]
  • xboxoneIcon xboxone pcIcon pc Occasionally, the caged Mirelurks will spawn outside of their cages. Caged Mirelurks only turn hostile when attacked, or when the Sole Survivor (or a companion) enters their cage, so the Mirelurks will roam around without turning hostile. [verified]
  • pcIcon pc ps4Icon ps4 xboxoneIcon xboxone Similar to one of the USS Constitution bugs, companions tend to repeat their location-specific comments over and over as long as they are in the quarry's vicinity.[verified]



  1. Fallout 4 Vault Dweller's Survival Guide - page 259: This marble quarry has gained a reputation as the source of the finest Mirelurk Meat in the Commonwealth, thanks to the still water giving the meat a less brackish flavor
  2. Vault Dweller's Survival Guide - Page 259