Oceans do not buffer us against jihad

A casual stroll by a Montreal municipal worker leads to a chilling discovery:

A sophisticated tunnel has been discovered near a major sporting venue and a university in Toronto, reports said Monday, with Canada on edge over the threat of possible extremist attacks. 

A municipal worker was walking through woods near York University and the Rexall Center last month when he spotted a piece of corrugated metal on the ground, lifted it up and found a passageway, the public broadcaster CBC said. 

The tunnel was about 23 feet long and 2.5 meters tall and was lit by an electric generator. The walls and ceilings had been reinforced and tools had been left inside. 

Toronto is hosting the Pan American Games in July and the Rexall Center is one of the venues. The facility also hosts major tennis events. 

National security officials have been alerted but there was no immediate suggestion the tunnel posed a threat, CBC said.

I don't think there's any kind of wide array of possible explanations.