Mass Fusion containment shed

The Mass Fusion containment shed is a location in the Commonwealth in Fallout 4.

Background
A lot of the backstory is implied at this site: there is a supervisor's terminal on the upper floor of the shed which has logs hinting at illegal activity and murder. The terminal allows you to unlock the security door on the lower level and, if you go into the caged area with the stacked barrels, there is a hole in the shed with an open water pipe, implying they were dumping waste into it.

Assuming they didn't murder the person hinted at in the supervisor's terminal logs, they most likely dumped him in the open water pipe where he mutated into a ghoul (as you approach it a ghoul crawls out of it).

Further proof of their waste dumping can found in the water monitoring terminal near Lake Quannapowitt, just north of the Mass Fusion containment shed, which contains pre-War reports of high radiation in the lake. Pre-War logs at Nahant Oceanological Society show that they were asked to confirm findings from Lake Quannapowitt; the scientist writing the log suspects illegal dumping is at fault for the lake's extreme radiation levels even compared to the rise at other sites they have been monitoring.

Layout
A warehouse storing many barrels of radioactive material. There are medium levels of radiation throughout the entire inside of the building. It contains glowing radroaches and feral ghouls. The computer to open the security gate is on the top floor, right above it.

Near the assembly line right in front of the the fusion core, between radioactive barrels, there's a hatch that leads into a subterranean chamber. In this subterranean chamber, there's a generator that can be deactivated. Doing this will result in the deactivation of the automated radio alarm broadcast that can be picked up after extending the satellites of radio tower 3SM-U81.

Notable loot

 * A fusion core on the generator behind the security gate.
 * A Vault-Tec lunchbox is located in the subterranean area or basement on the desk next to a broken terminal.

Appearances
The Mass Fusion containment shed only appears in Fallout 4.

Behind the scenes
It is possible to jump onto one corner of the lower roof, where one will find a synth and a human corpse. This seems to be a reference to the final scene of Blade Runner.

Bugs

 * Flipping the circuit breaker in the sublevel will sometimes fail to disable the automated radio alarm. A workaround is to return to radio tower 3SM-U81 and re-extend the satellites, then return to the containment shed to flip the breaker again.
 * Both of the ghouls that are hidden in the radioactive waste in the middle of the warehouse can not be looted directly. A workaround is to order one's companion to search the corpses. On PC, one can open the developer's console, click on the ghoul, and enter the command "openactorcontainer 1" as another workaround.

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