Apr 27, 2016

The Alaskan Way viaduct, which the two-mile Seattle tunnel will replace, is scheduled to be closed for about two weeks beginning Friday, April 29, as a precaution as tunnel boring begins under the structure. The tunneling machine is boring a double-decker traffic tunnel to replace the viaduct damaged in an earthquake in 2001.

: A worker walks inside the State Route 99 tunnel that is under construction Monday, April 25, 2016, in Seattle. The Alaskan Way viaduct, which the two-mile tunnel will replace, is scheduled to be closed for about two weeks beginning Friday, April 29, as a precaution as tunnel boring begins under the structure. The tunneling machine is boring a double-decker traffic tunnel to replace the viaduct damaged in an earthquake in 2001. (AP Photo/Elaine Thompson)

: A television reporter stands in view of the backside of the boring machine known as Bertha inside the State Route 99 tunnel that is under construction during a tour for media members Monday, April 25, 2016, in Seattle. The Alaskan Way viaduct, which the two-mile tunnel will replace, is scheduled to be closed for about two weeks beginning Friday, April 29, as a precaution as tunnel boring begins under the structure. The tunneling machine is boring a double-decker traffic tunnel to replace the viaduct damaged in an earthquake in 2001. (AP Photo/Elaine Thompson)

: A worker looks up as he stands partway up a circular wall inside the State Route 99 tunnel that is under construction Monday, April 25, 2016, in Seattle. The Alaskan Way viaduct, which the two-mile tunnel will replace, is scheduled to be closed for about two weeks beginning Friday, April 29, as a precaution as tunnel boring begins under the structure. The tunneling machine is boring a double-decker traffic tunnel to replace the viaduct damaged in an earthquake in 2001. (AP Photo/Elaine Thompson)

: Scaffolding surrounds the back side of the boring machine known as Bertha inside the State Route 99 tunnel that is under construction Monday, April 25, 2016, in Seattle. The Alaskan Way viaduct, which the two-mile tunnel will replace, is scheduled to be closed for about two weeks beginning Friday, April 29, as a precaution as tunnel boring begins under the structure. The tunneling machine is boring a double-decker traffic tunnel to replace the viaduct damaged in an earthquake in 2001. (AP Photo/Elaine Thompson)

: A portion of the upper deck of the new State Route 99 under construction rests just in front of the circular entrance to the tunnel Monday, April 25, 2016, in Seattle. The Alaskan Way viaduct, which the two-mile tunnel will replace, is scheduled to be closed for about two weeks beginning Friday, April 29, as a precaution as tunnel boring begins under the structure. The tunneling machine is boring a double-decker traffic tunnel to replace the viaduct damaged in an earthquake in 2001. (AP Photo/Elaine Thompson)

: Construction worker Antonio Roman smiles as he stands inside the State Route 99 tunnel that is under construction Monday, April 25, 2016, in Seattle. The Alaskan Way viaduct, which the two-mile tunnel will replace, is scheduled to be closed for about two weeks beginning Friday, April 29, as a precaution as tunnel boring begins under the structure. The tunneling machine is boring a double-decker traffic tunnel to replace the viaduct damaged in an earthquake in 2001. (AP Photo/Elaine Thompson)

: A portion of the backside of the massive boring machine known as Bertha is seen inside the State Route 99 tunnel that is under construction Monday, April 25, 2016, in Seattle. The Alaskan Way viaduct, which the two-mile tunnel will replace, is scheduled to be closed for about two weeks beginning Friday, April 29, as a precaution as tunnel boring begins under the structure. The tunneling machine is boring a double-decker traffic tunnel to replace the viaduct damaged in an earthquake in 2001. (AP Photo/Elaine Thompson)

Seattle tunnel under construction

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