While the research on the specific benefits of breathing techniques during cold water therapy is still evolving, some promising possibilities and general recommendations exist. 

Lets start by looking at the potential benefits of good breathing techniques: 

Deep and controlled breathing techniques during cold water therapy hold promise for several reasons. They might help you tolerate the initial shock of the cold by reducing feelings of anxiety and discomfort. Focusing on conscious breathing can promote relaxation and stress reduction, potentially making your cold water therapy experience more enjoyable. This focus on your breath can serve as a distraction from the physical sensations of cold, allowing you to maintain a sense of control during your cold water immersion. It's important to remember that individual preferences and best practices for breathing techniques can vary, so experiment and find what works best for you. 

Deep Breathing Techniques: 

Box Breathing 

Inhale slowly for a count of 4, hold your breath for a count of 4, exhale slowly for a count of 4, and hold for a count of 4. Repeat this cycle throughout your cold water immersion.

Diaphragmatic Breathing

Also known as "belly breathing," focus on breathing deeply into your belly, expanding your abdomen instead of chest. This can promote relaxation and deeper breaths. 

Exhale Focus 

Extend your exhales to be slightly longer than your inhales. This can have a calming effect and activate the body's relaxation response.

While breathing techniques may offer some benefits during cold water therapy, they shouldn't be considered a substitute for safety or professional guidance.

Before diving in, always consult a doctor, especially if you have any pre-existing health conditions. There's no one-size-fits-all approach to deep breathing exercises in this context. Experiment with different techniques like box breathing, diaphragmatic breathing, or focusing on longer exhales to find what feels most comfortable and effective for you. Regular practice of these exercises outside of cold water therapy can further enhance your control and awareness, potentially improving the benefits during cold water immersion. Remember to listen to your body. If you experience any discomfort, adjust your breathing or discontinue the therapy altogether.