Massive CSO Project In Portland

From Wired:

 Rosie the TBM prepares for tunneling. The East Side Big Pipe was completed in two nonstop drives, both originating from the Opera Street shaft.

 Havoc wasn't restricted to life underground. Drilling beneath the surface caused some settling in certain parts of town, up to an inch and a half at its worst. "We had some cracking in some of the building walls so we had to pay to repair them," said Gribbon.
Larger issues loomed. After Lewis and Clark retired from the west side pipe, their bigger TBM sister Rosie, a 10,000-ton behemoth, scoured the eastern riverfront. She was forced to carefully pick her way through freeway pillars driven deep into the bedrock. Safety regulations insist nothing can come within 30 feet of the anchors and Rosie's path led beneath the I-84/I-5 interchange.
But minor missteps and the daily grind couldn't match the danger facing Lewis as he dug beneath the Willamette. Lurking within 40 feet of the river's bottom meant that progress ground to a crawl.
Drilling requires enough slurry pressure to create traction but too much would cause a blowout, in which case debris would shoot into the river and threaten workers below. Slow and steady, the underwater drive was the only time work continued nonstop, seven days a week.

Cool stuff.  These projects were why I loved when we would get a subscription to Engineering News-Record at work.  The only downside was that I spent a good hour or so a week reading through the latest issue.