Sumner Tunnel Restoration

"Corrosion and wear-and-tear have deeply impacted wall panels and gutters. There's exposed rebar on the ceiling, and even after resurfacing, pavement conditions are poor – a fact that should be obvious to anyone who drives the length of the tunnel. Ventilation, drainage, security, and fire suppression systems all must be brought up to modern code. At this point, we're well beyond patches and repairs: the only way to keep the Sumner Tunnel in service is with a top-to-bottom restoration."

(Source: https://www.mass.gov/info-details/sumner-tunnel-restoration-project-history)