Toronto police essentially closed their investigation into a mysterious tunnel-like cave on Monday, announcing police had identified two men who had built the tunnel for "personal reasons," saying charges would not be laid and the investigation was over.

But though police may have stamped the file 'Case Closed,' members of the public are not quite ready to put the story to rest.

The hashtag #personalreasons quickly appeared on Twitter with users speculating, joking, and even in some cases demanding more information from police.