What to know about Fallout 4’s Under the Stars mod

• New quest: Under the Stars adds a quest called “Sunken Bunker” to Fallout 4.
• Underground location: The quest leads players to a facility beneath the Glowing Sea, west of Sentinel Site.
• Added content: The mod includes puzzles, voiced holotapes, an outfit and helmet, and two unique weapons.
• Download details: The mod launched on NexusMods on November 1, 2026, and received an update on November 3.

This article explains what the Fallout 4 mod Under the Stars adds and where its quest begins, so players can decide whether to try the expansion.

What does the Under the Stars mod add to Fallout 4?

Under the Stars is a fan-made quest and dungeon expansion for Fallout 4, created by the Commonwealth Story Expansion Project Team and available through NexusMods. Its new quest, “Sunken Bunker,” takes players into a large underground facility uncovered beneath the Glowing Sea.

Under the Stars adds a dungeon, a quest, puzzles, voiced holotapes, clothing, and weapons to Fallout 4.

The mod’s listed additions include:

• A large underground facility
• New puzzles
• A new quest
• Voiced holotapes to find
• A new outfit and helmet
• Two unique weapons

Together, the new dungeon and quest provide the main activity, while the puzzles, holotapes, outfit, helmet, and weapons add further content to discover along the way.

Where does the Sunken Bunker quest start?

The Sunken Bunker quest begins at a bunker in the lower part of the Glowing Sea, west of Sentinel Site. Finding the location starts the journey through the underground facility.

The quest marker identifies the bunker’s location in the Glowing Sea, and the facility is the setting for the new dungeon content.

Players can follow the map marker to the bunker, then explore the facility and its puzzles. The mod’s trailer is shown below:

When did Under the Stars release, and who made it?

Under the Stars released for Fallout 4 through NexusMods on November 1, 2026, and received an update on November 3. At the time reported, the mod had just over 4,000 downloads and almost 200 endorsements.

Under the Stars is described as lore-friendly and created without the use of AI.

The Commonwealth Story Expansion Project has also made other Fallout 4 mods, including the recently updated Fallout 4: Detour, which adds a town and quest, and Brothers in Arms: Return Of The Outcasts, a mini DLC-sized quest mod. Its smaller projects include Pete the Friendly Phantom, a Halloween-themed companion quest.

Players looking for more to do in Fallout 4 can use mods to add new quests and locations; Under the Stars is one option for exploring additional content in the game.

Is Under the Stars worth trying in Fallout 4?

Under the Stars may suit Fallout 4 players who want a new quest, an underground dungeon, and additional items to find. The listed content makes it a focused expansion for players who have already explored much of the base game.

The mod offers a new location and quest alongside puzzles and equipment, so players can weigh those additions against their interest in exploring another dungeon.

Where can Fallout 4 players download Under the Stars?

Fallout 4 players can download Under the Stars from NexusMods. The mod is listed under the full title “CSEP Presents – Under The STARS – Dungeon and Quest Mod.”

NexusMods is the stated download source for the mod.

What is included in the Sunken Bunker quest?

The Sunken Bunker quest includes an underground facility, puzzles, and voiced holotapes, with an outfit, helmet, and two unique weapons also listed among the mod’s additions.

The mod combines exploration and puzzle-solving with collectible story items and equipment.