This time-lapse video shows the slow process of lowering Bertha's cutter head and drive unit back into the 120-foot access pit.
By DANIEL DEMAY, SEATTLEPI.COM STAFF, Seattle Post-Intelligencer
Thu, 08/27/2015 - 1:30pm
This time-lapse video shows the slow process of lowering Bertha's cutter head and drive unit back into the 120-foot access pit.