The International Information Center for Structural Engineers

Monday, 13 November 2017 01:00

A drone flight inside Seattle’s SR99 tunnel

Written by  TheStructuralEngineer.info
A screen grab from video recorded inside Seattle’s SR 99 tunnel as the drone arrives at Bertha’s cutterhead. (Via WSDOT) A screen grab from video recorded inside Seattle’s SR 99 tunnel as the drone arrives at Bertha’s cutterhead. (Via WSDOT)

It was April 4, 2017, when the work of tunneling machine Bertha was complete, breaking through into her disassembly pit and marking the end of the 1.75-mile long State Route 99 (SR 99) tunnel beneath Seattle. Now, the Washington State Department of Transportation released a drone video that shows the ongoing construction work from end-to-end inside the tunnel.

 The tunnel will host a new double decker highway, which is expected to be ready in 2019, with its upper roadway being more than 85% complete already. It will have four lanes, lighting, ventilation, and fire detection systems and has an estimated cost of $2.1 billion. 

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