Wow I never had the overheating problem that you folks have. In fact I got to like bringing my old canvas tent and my 80,000 BTU heater. We've had some good comfortable weather for ice diving but we've had some darned cold and nasty days too.
We usually have a pretty big group and that means lots of time standing around between dives. Tenders and safety divers obviously can't be in the tent eating chilli with every one else. LOL
While teaching ice diving I've probably done as many as half a dozen or more ice dives in a day and once I did like 5 without ever leaving the water...take two students down, bring em back and pick up two more. While I have the equipment to deal with the conditions being too warm usually isn't a problem except maybe while cutting the hole and preparing the site. Working up a sweat early on just makes things that much colder later on it seems.
The chilli and the occasional fire are the major focus of our ice diving activities and some folks come just for the chilli and are smart enough to stay out of the water. LOL Others pop in for one quick dive, get dry and warm and spend the rest of the day tending the fire and stirring the chilli.
How many times have I mentioned chilli now? Ice diving is a neat thing to try but my fondest memories of it seem to have more to do with the chilli than the ice. In fact, and maybe I'm getting old, but these days I'd rather just get together with some folks for chilli on a winter afternoon and skip all the work of hauling my gear out onto the stupid ice. LOL
By all means, enjoy your ice diving. If I'm ever in the area I'd be happy to stop by to help tend the fire and share your chilli. If you ice dive without chilli I would submit that you are not properly trained and you should see to that definciency immediatly before conducting further ice diving activities...rescue work aside of course.
After all thius ice diving talk, I think I'll ask my wife to cook up a batch of chilli.
Global warming by fanny! we have snow on the ground!