My friend Geoff Mueller and I will slog a number of miles tomorrow, high up into Rocky Mountain National Park. Our packs will be loaded with underwater cameras, dry suits and snorkel gear. We’re in pursuit of some underwater photos, specifically the greenback cutthroat for Geoff’s new book about the underwater environment of trout.

Last October we had the privilege to spend a couple days with John McMillian, a fisheries biologist from Washington state. He took us around and showed us some of his secret spots and gave us the skinny on the best ways to try and shoot underwater photography for fish in cold water environments. This video by Shelly Solomon and Leaping Frog Films shows how John physically counts fish individually by hand while drift diving a tiny stream in the middle of winter. Brrrr.

While tomorrow isn’t going to be as cold as the weather in the video, it’s not going to be warm either. We’ll be getting in at 10,000 to 11,000 feet. The air temp is going to be in the upper 40s or 50s and the water temperature is much colder than that. Anyway, I’ll be sure to give a full recap and let you know how the adventure goes. In the meantime, enjoy the video and send warm thoughts my way.