Cooling down without Air Conditioners

[ShadowHM]

  I dive in Superior, which in the height of summer even at the surface hardly breaks 60F.  At 100 ft, the temperature is barely above freezing. 

I am gaping with admiration for your fortitude. I learned to scuba up in Smooth Rock Falls, Ontario and we had to delay our open water test, due to the lakes still being ice-covered when the course was over.

It was damned cold getting into that lake after the ice went out. I hesitated so long at the buddy breathing due to reluctance to let any more of that freezing cold stuff touch my face that I nearly failed the exam.

I quit scuba diving many years ago, due to lack of partners, and confine myself to snorkelling in Lake Huron now. And it is still damned cold below the first thermocline.

Congratulations for sticking it out and just doing it.