The Toronto Transit Commission is opening the door to a secret world of abandoned subway stations and secret passageways in its latest YouTube video.

In it, TTC CEO Andy Byford and spokesman Brad Ross descend into Lower Bay (or Bay Lower as they insist it's called) to talk about the disused station's appearances in Hollywood movies, music videos, and its use as a test area.

Lower Bay saw use when some Bloor-Danforth line trains would run via Union to Eglinton.

The pair then visit Lower Queen, the roughed-in underground streetcar stop at Queen and Yonge. This area, long off-limits to the media and public, was built with the Yonge line when the TTC planned to run the Queen streetcar in a tunnel through downtown.

Previously only Lower Bay has been open to the public during the Toronto Doors Open event.

Check it out.

Chris Bateman is a staff writer at blogTO. Follow him on Twitter at @chrisbateman.