It's looking more and more likely the Green Line LRT will go underground through downtown Calgary. That section will, in turn, connect with the southeast portion of the Green Line, which is further along in the planning process and has a set route. He also pointed to undeveloped sites that will be affected if an elevated line is built. ​The full-tunnel route would see the LRT line run underground from 20th Avenue North all the way south to the Beltline in a tunnel beneath both the Bow River and downtown Calgary. The transportation and transit committee was told the underground option is ranked higher than four other options, as an elevated line could lower property values downtown.

Source: CBC News June 15, 2016 22:30 UTC