Toronto's mystery tunnel: What's it for?

Twitter is rife with speculation on what the purpose of this hole in the ground could have been.

Who dug this tunnel? Or is it more a trench? When did all of said digging happen? Why tunnel? WHY?

The Toronto Mystery Tunnel of Secrecy has just about everyone stumped. Even after the police news conference this morning, people have more questions than answers. 

Who dug this tunnel? Or is it more a trench? When did all of said digging happen? What purpose does this structure serve? 

Just… why? 

RELATED GALLERY: Inside Toronto's mystery tunnel

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