Will hypoxic sets improve my ability to swim without air?

From what I understand, breath control training largely provides little (if any?) physiological training effect other than from the work itself (which is hindered anyway, making it a waste of time for training any of the energy systems). I assume there is room to mentally adapt and learn how to manage hypoxic suffering. But other than developing a strong aerobic base and increasing level of conditioning, can one actually have room to improve their hypoxic capacity specifically through hypoxic training? Thank you!
Parents
  • Last month I did two 50 fr events within one hour, the second one was a split req. from a 100. The first 50 fr event I took one breath out, and once back. The second 50 fr I forgot to breathe to the wall, breathed once back but dropped my time by 0.45s. I kept this method the following day (one breath back) in a relay and dropped the time another 0.36s. Then 10 minutes later for another relay another drop by 0.05s. One change that happened throughout the meet was a linear decrease in anxiety, one main contributor of my stress is worrying about my breathing plan, the second was the turn. I believe I can have a better performance through stress management, moreover learning how to do the entire 50 without a breath.
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  • Last month I did two 50 fr events within one hour, the second one was a split req. from a 100. The first 50 fr event I took one breath out, and once back. The second 50 fr I forgot to breathe to the wall, breathed once back but dropped my time by 0.45s. I kept this method the following day (one breath back) in a relay and dropped the time another 0.36s. Then 10 minutes later for another relay another drop by 0.05s. One change that happened throughout the meet was a linear decrease in anxiety, one main contributor of my stress is worrying about my breathing plan, the second was the turn. I believe I can have a better performance through stress management, moreover learning how to do the entire 50 without a breath.
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