Really great detail about risks of deep diving. It is not easy to deep sea dive.
This oxygenated PFC liquid has been saving human lives. When babies are born prematurely, before 28 weeks, they have difficulty breathing for various reasons. Immature alveoli, the final branchings inside the lung that feed oxygen into the blood, lack vital surfactants which stop the tiny cavities sticking together when we breathe out.
Oxygenated PFC is able to help those babies to breath in a liquid environment till all the internal branching of the lungs are completely formed. These kids are able to live normal lives full of memories afterwards. But the process is used in extreme cases as the full effects of PFC in the body is not well understood.
Great research you have done and we need more detail research regarding PFC liquid.
It is still in the experimental phase except in the extreme cases of premature babies which some US hospitals perform as a last resort.