Just in time for the smoke-alarm-driven downtown transit tunnel closure, Sound Transit released its photo of the week today. The accompanying caption:Getting ready for service

Air flow testing, which included disbursing smoke to visualize air movements, was completed this week at the underground Beacon Hill Station. If needed, the station’s emergency ventilation fans can move 880,000 cubic feet of air per minute. Additional “jet fans” at the portals offer additional capacity to remove smoke and maintain a safe environment for Link passengers in an emergency. Link passenger service begins July 18.