I recently found this photo; the original must have been taken by 2Lt Rick Mitchell on this exercise back in September 1981. We were aboard HMCS Porte. Jean, an elderly Gate Vessel from WW2. We were dropped off Oshawa towards dusk and had 10 patrols fan out with different objectives -- and permission to test the security of the Darlington Nuclear Plant, the GM Factory, their municipal airport (my objective), and a number of other sites. The citizens of Oshawa were promised rewards for information that resulted in the capture of any of our patrols and the Durham Police and Ont Rs were out looking for us. None of our patrols were captured, despite traipsing through much of the city that night -- although parts of the city were much livened by the occasional (blank) gunfight.
A major wind storm mitigated against the original exfiltration plan, instead we fell back on the city's harbour and boarded our vessel in a more orderly manner. There was a lot of chop out on the lake and the Gate Vessel bucketed around rather alarmingly -- leading to no few cases of acute sea-sickness, mostly among the Naval Reservists who crewed her.