Well one thing's for certain. The individuals involved are going to feel a pinch on this one. And Canada has an extradition treaty with the US; so there's no cover for them... Given that Canada no doubt values it's relationship with their neighbors down south; they will be offering assistance from their own side of the border...
Still, all things said, I would have expected a tunnel to have lead back to Panama or something, rather then Canada. But perhaps Panama is too far away for such a construction...