May I suggest a great book about HBO. The Oxygen Revolution by Paul G. Harch., and Virginia McCullough ISBN 978-1-57826-237-3.
Interesting sites on the subject are www.hbotoday.com. and www.oxytherapy.com. Otto Warburg,M.D. published a lot on cancer and oxygen. He was given the Nobel prize in medicine two times and nominated a third.
I have done 40 dives in my cancer treatments and not related to radiation which I have refused during my 10 year journey.