(Seattle, WA)  --  It's nearly 30 months late, but the giant tunnel-boring machine known as Bertha is about to reach the finish line.  The huge drill is scheduled to reach its final underground destination in the area of Thomas Street and Sixth Avenue North in the next few days, after having created the 92-hundred-70-foot tunnel.  Transportation officials say the final phases of the drilling project for the Alaskan Way Viaduct replacement could take up to 20 days.