Lower body temperature during prolonged dives can lead to shivering and weight decrease.

“pretty sure the temperature really has to have a difference because you come out and you're kind of shaky you know even though you feel very comfy when you're down there the first two or three hours and then by the end the last you know four or five six hours for a longer evie a you start like shaking a little bit uncontrollably you know but it's kind of subtle even though the water is kind of warm like it feels warm but it's just you know your body temperature is going down and they were on the days maybe I wasn't getting as much calories as I as I needed I came out of that mission lighter than I've ever been before”