| ||For the company, see Poseidon Energy.|
The facility's exterior is almost surrounded by catwalks patrolled by several raiders. The front and roof access doors are both Master locked. The southeast side of the facility has two drainpipes, one of which can be used to enter the Poseidon Energy sublevels.
The sublevel is partially submerged, making it a home for mirelurks, with a few automated defenses thrown in for good measure. There are two Novice-locked safes with minor loot: one through a submerged doorway near the security door terminal, and the other in an office supply closet with skeletons.
Entering from the sublevels leads right to the front door. A Novice-locked wall safe is near the "Restricted Area" sign visible from the front door. Through the yellow-lined doorway is another security terminal with a door. Opening this door will activate the main floor's automated defenses, which will start fighting the raiders on the catwalks above. Progress is pretty linear through this area with just a couple of side rooms, one of which contains a chemistry station. A short jaunt beyond the chemistry station is the ramp to the roof access door. Cutty clad in raider power armor awaits in the central structure, guarding the Endurance bobblehead and a Tesla Science magazine.
Synths have been sighted here attacking the raiders inside the building. Depending on level, there may also be a courser. If one has a good relationship with the Institute, they will not attack.
- Endurance bobblehead - On a desk in the upper area that contains the 'Glory' chair.
- Tesla Science Magazine - On a desk in the upper area room with two mattresses in it (the bobblehead and magazine are side by side on the same desk).
- Two Vault-Tec lunchboxes - In the lower flooded levels at the end of an underwater pipe in the west section, and on the eastern corner of the factory floor behind a ramp on the lower shelf.
- Cutty drops the Poseidon Energy key, which unlocks both the front and roof doors.
- A complete Giddyup Buttercup underwater in the area with the broken pipes in the northeast.
- Opening the security door on the floor level will reactivate the dormant security turrets and protectrons within the facility.
- There is a flooded sub-level inside.
- There are two Master locked doors located on the car park and on the roof that can be used for easier access to the Endurance bobblehead and Tesla Science magazine.
Poseidon Energy appears only in Fallout 4.
PC Playstation 4 Xbox One Cutty may not be hostile towards the player character, likely due to the appearance of the synths.[verified]