Wilderness Cold Plunge (Annette, Andy, & Lucky)

Wearing just our underwear in sunny 0°C conditions for a day-trip experiment out in nature away from the city.
We each spent about 30s in the water. After getting out, my hands started vibrating followed by my body feeling like it was covered in Tiger Balm.
The ice on this lake was about 1.5 feet deep with interesting layers from different periods of freezing. The water temperature ranged from 0.1°C near the surface to 0.6°C below the ice. We estimated the depth at this spot to be about 15 feet so for safety, we used paracord to leash ourselves to a tree. Monika was our on-site wilderness first-aid certified nurse and maintainer of the camp fire :)
Although I've seen the cold protocol as mentioned by Dr. Andrew Huberman and Dr. Susanna Søberg (and also heard of Wim Hof) we didn't do this with that intention...more just for the adventure.