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Drone video gives up-close look inside SR 99 tunnel
SEATTLE — Bertha the tunnel-boring machine has now excavated 117 feet of the 385 feet needed before the SR 99 Alaskan Way Viaduct can reopen to traffic.
Seattle Tunnel Partners has installed 17 rings since mining started up again on Friday, WSDOT announced Tuesday morning.
State transportation officials also released new drone video showing progress inside the tunnel.