Thicket Excavations

Thicket Excavations is a location appearing in Fallout 4. It is marked with the quarry symbol.

Layout
A fenced in quarry area that has been flooded. 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.

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; 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.

Some time after completing Sully's quest, you may hear that an allied settlement is being attacked by raiders stationed in the quarry.

After completing the quest Pull the Plug, and 24 hours have passed, Sully Mathis will be hostile, and be the leader of a raider gang which he initially commented about doing in his terminal entries.

Notable loot

 * Taboo Tattoos - In the trailer directly southwest of the water pump.
 * Sully's journal - Holotape in the east trailer inside of a terminal.

Appearances
Thicket Excavations only appears in Fallout 4.

Bugs

 * 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.
 * If you swim under water 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.
 * 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.

Gallery
Карьер Тикет