Quarry
Quarry is an old mining town in The Senators territory. It was abandoned after the military takeover. The area is undermined by mineshafts, which some of have collapsed and formed sinkholes. These tunnels were used as escape routes out of Fort Anne.
Before the Senators takeover, many preppers lived here and dug out a lot of underground bunkers and tunnels. Some even lead all the way to Fort Anne.[1]
References:
[1] Darla talks about Quarry Ch08pg23