I have linked some videos with Dom D'agostino before about hyperbaric oxygen. Here is one featuring more of his research. He is a former Navy Seal himself and works with research concerning oxygen toxicity in Seal divers using pure oxygen diving. But that is not all the research he is involved in. Also cancer and some other stuff. Hyperbaric chambers have also been used in cancer treatment with some success. Research is ongoing.

https://www.youtube.com/watch?v=yWRnma8Tet0&t=827s

https://www.youtube.com/results?search_query=dom+d%27agostino+cancer