The TTC made a rare double breakthrough with its tunnel boring machines last week, and the event was posted on YouTube .

Powerful boring machines, dubbed “Yorkie” and “Torkie,” broke through at the same time to excited applause during work on the 8.6 kilometre Toronto-York Spadina subway extension.

The extension runs from Downsview Station northwest through York University and north to the Vaughan Metropolitan Centre in York Region.

By the fall of 2016, you can expect to catch a train northbound from the existing Downsview Station to the Vaughan Metropolitan Centre at Highway 7 and Jane Street, the Toronto Transit Commission says on the website, with a map indicating the route.

The video, posted on Nov. 29, shows the machines boring through an extraction shaft located on Keele St., just north of Murray Ross Parkway.

“Yorkie” began the first northern tunnel drive from the Steeles West Station launch shaft last December.

“Torkie” began tunnelling in February, 2012.

The TTC says this breakthrough made project history as the first double tunnel boring machine breakthrough, which is a rare occurrence in North America.

The tunnel boring machines will now be disassembled and moved north to the Highway 407 Stations site where they will build the remaining northern tunnels.

The machines bore an average of 15 metres a day.

The video, as of Thursday at 8:30 a.m., had 369 views and 29 likes and not one dislike.