The 240-metre-long tunnel—slightly longer than two football fields—spans the Western Gap of Toronto Harbour thirty metres below ground and ends the need to catch a ferry to get to the airport. Each of its four moving sidewalks, two in each direction, travels at 2.3 kilometres an hour for a maximum trip length of six minutes. Pedestrians on the mainland enter through a new pavilion, down an escalator and onto the walkway, then emerge into an extension added to the airport terminal building on the island. The scope of work included eight elevators and six escalators.
The tunnel was built through a public-private-partnership agreement between PortsToronto, Forum Equity Partners, and lead contractor PCL. Much of the funding came from airport improvement fees paid by passengers.