Timelapse of Seattle's tunnel boring machine

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by KING 5 News

KING5.com

Posted on June 6, 2013 at 6:55 PM

Updated Wednesday, Jul 3 at 3:12 PM

Construction crews are getting the tunnel boring machine ready to begin work under Seattle.

Created using over 700 photos taken from the OxBlue construction camera every 14 minutes, this time-lapse by David Garden gives a glimpse of the work that went into the fourth week of Bertha's assembly.

She is the world's largest tunnel boring machine at 57.5 feet in diameter and will be 326 feet long when she is ready to begin tunneling under Seattle's waterfront next month.

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