In 1981, CBC Radio's Morningside interviewed author John Melady. On the show, he detailed the escape of 28 German POWs from Camp X in Angler, Ontario during WWII.

The prisoners dug a 150-foot tunnel through the camp's exercise yard.

From the summary page:

It took a week for the escapees to be tracked down...two were found in downtown Montreal, while one was discovered in a barbershop in Ottawa and two others made it as far as Medicine Hat [Alberta].

Listen to the Escape from Camp X (5:17)