High Quality Content by WIKIPEDIA articles! The Downtown Seattle Transit Tunnel, also referred to as the Metro Bus Tunnel, is a 1.3-mile (2.1 km) public transit tunnel that runs the length of downtown Seattle, from 9th Avenue and Pike Street to 5th Avenue S. and S. Jackson Street. Approved by Metro Transit in 1983, construction began in 1987. It was completed and service began in 1990, at a total cost of $455 million. In May 2000, the King County Council transferred ownership to Sound Transit but ownership was transferred back to King County Metro in 2002.