Left in Bertha’s wake, crews have been constructing a living, breathing SR 99 under Seattle. “It’s really a large mechanical plant,” said Brian Russell with HNTB Corporation. “Within that facility ...

So much, with Seattle-area tunnel-boring machines, stems from Bertha. Pre-Bertha, we were blessed with giant underground drills named for heroic sled dogs — Balto and Togo — who helped deliver ...