The Castle tunnels

The Castle tunnels is a location in the Commonwealth in Fallout 4.

Accessing
The entrance to the Castle tunnels is quite difficult to find if you are not doing the quest Old Guns, and is hidden and cannot be accessed unless you have unlocked the workshop for the The Castle during the end part of the quest Taking Independence. Once you have the workshop unlocked, head to the East Tower of the castle and head into the corner room. Then, look to your 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.

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. There are bottles of Amontillado wine and a skeleton encased by brick which is a reference to The Cask of Amontillado by Edgar Allen Poe where General McGann's body is found.

Notable Loot

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

Appearances
The Castle tunnels appear only in Fallout 4.

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