This part proved to be quite challenging, trying to line up the sewers so it connected from the well trap to the riverside exit was tricky, but I think I I made it look alright.
The last few images are supposed to be the red room Easter egg that randomly occurs when pressing the buttons to reveal the Ubersprengen. Unfortunately the mod I used seems to be a little broken, but it still got some cool shots.
The other images at the end are there to show the progress of the frozen river and the exterior of the town.