[quote=chukklehed]
Not that far south, I mean just that space below the city. You know, so they don't have to march around a lake from their camp which was described as "To the east, between the lake and the mountains"Also they're kinda blocking Artemis's escape route right now.
[/quote]

What your saying makes perfect tactical sense, but it is more difficult to execute geographically. They would have had to spend days or weeks more arcing tunnels that could collapse at any moment into the proper position, or risk discovery by surfacing and traveling over land.