Sawmill Grinders And Old Piers: A Historian Talks About What Could Be in Bertha's Path

KUOW | By Christine Streich

Published December 12, 2013 at 1:47 PM AKST

Previous development of Seattle's waterfront may have left behind impediments to Bertha, the SR 99 tunneling machine.

Marcie Sillman talks with Jennifer Ott of HistoryLink.org about one possible cause of the SR 99 tunneling machine’s blockage: leftovers from Seattle's historical waterfront development.

For other, more humorous, theories check out our What's Blocking Bertha? compilation.