Time lapse: Giant tunnel cutter offloaded on Seattle waterfront

SEATTLE - Crews on Sunday carefully offloaded a giant green cutter designed to chew its way underneath Seattle, creating a highway tunnel that will replace the aging Alaskan Way Viaduct.

The hulking cutter is the first large piece of the $80 million tunneling machine, named "Bertha," to be unloaded since it was brought 5,000 miles by ship to Seattle from Japan.

Moving at a slug-like pace of 2 mph, the cutter was carried aboard a special transporter from Pier 46 toward a deep pit where it will be lowered and begin tunneling this summer.