The Castle tunnels

The Castle tunnels is a location in the Commonwealth in 2287.

Layout
The entrance to the tunnels is difficult to find prior to beginning the quest Old Guns. It is hidden behind rubble and cannot be accessed unless the workshop for the Castle has been unlocked by completing the quest Taking Independence.

Once the workshop is unlocked, head to the east tower of the castle and head into the corner room. Then, look to the left and there will be a pile of rubble which can be scrapped in workshop mode. Upon scrapping this rubble, the stairs leading down to the door to the castle tunnels will be revealed.

The tunnels are winding but essentially linear. Hazards include mines, explosive gas, radiation areas, and turrets. Storage areas are encountered first, then an area with workbenches and a fusion reactor (with a core). Finally there is a barracks (with usable beds), and command room with terminals and the corpse of General McGann. In this area there is a malfunctioning, hostile sentry bot named Sarge, which guards the locked security door to the armory at the end. However the armory itself can only be unlocked by Ronnie Shaw during the quest Old Guns.

Notable loot

 * Fusion core - In the generator near the end of the tunnel.
 * Laser muskets - One in the room on one of the shelves just before the fusion core, and one near General McGann's corpse.
 * Minutemen general's uniform and hat.
 * Ten cannonballs on shelves in one of the storage areas early in the tunnels.
 * Seven full Montressor Amontillado bottles of wine and four empty ones, found in a crate near General McGann.

Appearances
The Castle tunnels appear only in Fallout 4.

Behind the scenes
Toward the end of the Castle tunnels, near General McGann's body, is a crate of Amontillado wine. Opposite the wine is a skeleton seemingly entombed in a wall. This is a reference to Edgar Allen Poe's story The Cask of Amontillado, where the protagonist's enemy is lured into an underground vault, chained and then encased behind a wall. The label of the Amontillado bottle reads "Montressor, Amontillado, Bottled by P. Edgar" again refers to the work of Poe and the protagonist, Montresor.

Gallery
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