Fallout 4 mod Under The STARS adds sunken bunker dungeon and quest
The Commonwealth Story Expansion Project's lore-friendly mod launched on NexusMods on November 1, 2026, with an update two days later.
The Fallout 4 mod "CSEP Presents - Under The STARS - Dungeon and Quest Mod" is available to download on NexusMods, according to ScreenRant. The Commonwealth Story Expansion Project Team released it on November 1, 2026, and followed with an update on November 3.
The mod adds a large underground facility, new puzzles, voiced holotapes, a new outfit and helmet, and two new unique weapons. Its new quest is listed on the map as "Sunken Bunker", with the bunker itself located in the lower part of the Glowing Sea, west of the Sentinel Site.
The team says the mod is lore-friendly and was made without the use of AI. At the time of writing it has just over 4,000 downloads and almost 200 endorsements on NexusMods.
Earlier work from the same team
The Commonwealth Story Expansion Project has previously released other Fallout 4 mods, including "Fallout 4: Detour", which was recently updated with a new town and quest, along with "Brothers in Arms: Return Of The Outcasts" and "Pete the Friendly Phantom". Fallout 4 itself is eleven years old.
Quick answers
Where can I download the Fallout 4 Under The STARS mod?
It is available on NexusMods, where it was released on November 1, 2026, and updated on November 3.
Where is the Sunken Bunker in Fallout 4?
The mod places the bunker in the lower part of the Glowing Sea, west of the Sentinel Site.
What does the Under The STARS mod add?
It adds a large underground facility, new puzzles, the "Sunken Bunker" quest, voiced holotapes, a new outfit and helmet, and two new unique weapons.