Thanks for all the helpful posts.
I contacted Parks Canada who operate the CDMM (Centre de Découverte du Milieu Marin) at Les Escoumins and received the following response:
Good day,
Thank you for your interest in Parks Canada.
You can purchase the temporary diving permit of 30 days at the CDMM at the base for diving. You need to prove that you have done a minimum of two dives in cold water with a cowl and mitts (proved in your diving book). If you don't have this requirement, you can dive with a mandataire at this
same location and then you will be able to get the temporary permit. The cost of this permit is 5$.
Don't hesitate to re-enter in contact with us for any other information.
Have a nice day,
Charming and helpful. I think we will enjoy diving here. We are all cold water, drysuit divers so we should be in our own element. I love Scuba Board for great info.
So you need to show pics of you dressed as Batman and diving? Boy that is a weird requirement!