They're calling it a record-breaking engineering feat that will amaze the world.

Stretching high above the village of Whistler, B.C., is the Peak 2 Peak Gondola, which is set to open in time for the 2008/2009 ski season in early December.

Designed to carry 2,050 people per hour each way between the Whistler and Blackcomb mountain peaks, it has presented some very significant engineering challenges.

But this week the project reached a major milestone when engineers succeeded in stringing three of the giant spools that will support the system along four giant towers.

This was not an easy build for engineers, CTV understands. Technically, stringing cable across four towers and four kilometers is extremely difficult.

That's because the distance between the second and third towers is over three kilometers long and there's nothing but air underneath.

On top of that, weather was another extreme challenge in the build, said Whistler Blackcomb President Dave Brownlie.

"To meet our timelines we had to clear, huge, huge amounts of snow just to start construction,'' he said.

As a result, the construction window closes pretty fast once fall comes. For more information, please check the Peak 2 Peak website.

With a report by CTV British Columbia's Kate Gadozik.