The Castle tunnels

 is a location in the Commonwealth in Fallout 4.

Layout
Long, fairly linear tunnel. A sentry bot named Sarge guards the door to the armory at the end, but the armory can only be opened during the quest Old Guns.

Notable loot

 * Fusion core near the end of the tunnel
 * Laser musket in the room just before the fusion core.
 * Minuteman general's uniform including hat.

Appearances
appears only in Fallout 4.