As strongly hinted in the game's dialogue, the purpose of the tunnel is more than just as a free way to get to and from the mountains... (cue suspenseful music!)
Coming in a future update :)
Viewing post in Corrupted Kingdoms (NSFW 18+) comments
oh dang didnt expect a response , yeah was looking around after the post trying to trigger stuff and think i know where the areas going in future updates are going and cant wait , oh also hoping some of east hallway peps get a update and adds more to their plots, would love if ami could go to college and get a little charcter arc, though i might just have not found it yet