More from KUOW Government What's In Bertha's Way? KUOW | By Christine Streich Published December 10, 2013 at 1:50 PM AKST Twitter LinkedIn Email Listen • 4:09 Flickr Photo/WSDOT (CC-BY-NC-ND) Bertha, the drilling machine digging out the SR 99 tunnel, has run up against an unknown impediment. Marcie Sillman talks with Seattle Times transportation reporter Mike Lindblom about what may have halted Bertha, the huge tunneling machine in charge of digging the new SR 99 tunnel.