Fallout 4 is a game that is very popular with fans of the franchise, as can be seen on OpenCritic, where it is recommended by 89% of players. This is due to its unique and frightening universe, but also by these numerous features. But that's not all, because a large community of modders has formed around this title, offering various projects, and one of them might give you chills.
Named Blue Hills Research Facility, this mod is an add-on to the Fallout 4 storyline and offers free additional content, as can be seen in its description:
"Uncover the terrible secrets of a pre-war U.S. Army Research Facility in a new, lore-friendly quest dungeon inspired by atmospheric sci-fi horror. Piece together the story of the facility's fall, solve its mysteries, and face the nightmare that has been waiting in the dark for 200 years.”
In the latter, you will be able to explore a dungeon divided into three distinct areas. There will be puzzles to solve and new enemies to face, such as robots, humans, and creatures inspired by Alien. But be careful, because this dungeon is considered difficult, so you will need to be well prepared.
In addition, this mod should only be played if you have reached the middle or end of the game with powerful equipment. Not to mention that you must also have installed the Zetamorphs mod and all the game's DLCs. Otherwise, compatibility may not be optimal, which could spoil your experience.