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Go deeper: Why Musk's Chicago tunnel could be a pipe dream

Elon Musk discussing his hyperloop project
Elon Musk discussing his hyperloop idea at a competition. Photo: Kate Allen/Toronto Star via Getty Images

Chicago Mayor Rahm Emanuel has selected Elon Musk's The Boring Company to build a high-speed tunnel transit system to link the city's O'Hare International Airport with its downtown Loop, the Chicago Tribune reports.

The big picture: While Musk has dreamed big and delivered before with his SpaceX venture, it's a massively ambitious project for a company that is still in its fledgling stages with plenty of hype and marketing but few proven test cases of its technology.