Ok I found something interesting. Just west and slightly south of Sunshine tidings co-op there’s a Bar, like a level one Food and Drink store you would build in a settlement. No one’s manning it but right next to it is a huge pipe that continues west only partially buried until it reaches the map limit. To the east it eventually is covered with dirt. I wander if it continues underground until in emerges in the harbor? These little things make the game fun.

I followed the pipeline to see how far it would go and ended up at the end of the map. I tried to free roam the camera so I could enter the pipe. Its got nothing special in it. makes me suspect its just an environmental piece.

Or the starting point to a DLC to be opened in the future?