sink hole

State Halts Seattle Tunnel Project Over Safety Concerns
State Halts Seattle Tunnel Project Over Safety Concerns
State Halts Seattle Tunnel Project Over Safety Concerns
  SEATTLE (AP) — The state has halted the digging of the new Highway 99 tunnel under downtown Seattle after a sinkhole formed along the waterfront. Gov. Jay Inslee and the Department of Transportation said Thursday they ordered Seattle Tunnel Partners to suspend digging operations by the massive tunnel-boring machine known as "Bertha" until the contractor can determine what caused the si