> “If it weren’t for the bearing failure (it was the largest boring machine by far at the time), they would have come out okay.”
That is sort of like Custer saying that “If it weren’t for the Indians, they would have come out okay.”
LOL. I had my doubts on the tunnel due to the variable geology. Some of the tunnel route is the hydraulic fill of loose sand. Other portions are a wide variety of overburden dumped by the glaciers (gravel, clay, silt, etc.) I think it was something like ten different types of materials they had to dig through. They did have some issues with subsidence due to when it was stuck.