BOSTON (CBS) — A new underground walkway connecting the North Station Commuter Rail and T platforms is now open, providing easier access to the TD Garden.

The new underground walkway opened Sunday (WBZ-TV)

The pedestrian tunnel opened Sunday to provide a direct connection between the Commuter Rail station and the platforms for the Orange and Green lines. T riders will be able to get to the Garden without going outside.

The new passageway connection the North Station Commuter Rail and MBTA. (WBZ-TV)

The Garden says the passageway provides more efficient access and relief from inclement weather.

It’s just one development in a $100 million, two-year expansion project for the Garden. The home of the Bruins and Celtics is adding more restrooms, new team locker rooms and more dining options for fans.