You stand, re-orienting yourself. You approach your lantern, pick it up, and reattach it to your waist.
Taking in your surroundings, you find yourself in a long, straight, man-made tunnel of sorts, roughly 8 fulms in diameter. Its branching paths vaguely remind you of a mine, but its walls are noticeably too smooth to have been a simple mineshaft. Was this used for smuggling people over the Eorzean border undetected? If so, from where?
Staring down the tunnel, you find it strikingly similar to your descent--darkness, stretching on seemingly forever without end.
The only way through is forward.