Hey Boomer;
I spent 3 months in Churchill in the summer of 1991. What a great experience working at the Northern Studies Centre!
For "protection" I carried a 12-gauge marine shotgun filled with cracker shells followed by two slugs. As you know, in the summer heat, most bears just want to wade in Hudson Bay and have no interest in making chase. I started with a 303 Enfield, but the bloody thing was too heavy and couldn't hit the broad side of a barn.
However, as you already noted, my main "protection" were my eyes and being aware of what was going on around me at all times, as I did an 11 kilometre loop in the tundra each morning collecting measurements from various climate measuring stations. This was solo -- unless you consider the millions of ginormous mosquitos company.
I once awoke in my cabin (are they still there at the Northern Studies Centre?), to a 1500 lb + male polar bearing looking at me through my bedroom window. Let me tell you that I woke up REAL FAST that morning!!
Thanks for sharing the photos and putting things in perspective for the rest of the readers here.