Calories Burned Sea Kayaking On SCUBA, Why Does Your Air Consuption Rate Increase With Depth?

On SCUBA, why does your air consuption rate increase with depth? - calories burned sea kayaking

Obviously the body needs a certain amount of oxygen needed to function. If a mountain to climb, have difficulties with the lack of oxygen have. At sea level, we have a lot of oxygen. Why, when we descend into the depths, we need more exygen? We burn more calories. I have something on the breathing reflex is triggered by the accumulation of CO2 instead of oxygen deficiency. Is the game in all this?