I read an earlier thread about breathing O2 during surface interval after deep dives. I have been bent once without the need of a deco chamber. After an hour on the phone with DAN they saw no apparent reason that I got bent. No apparent mistake was made on my dive. A deco diver suggested breathing O2 during surface interval so I’m in the research mode. If I were to do this between deep dives as a precautionary measure and not to reduce surface interval time, what percent O2 is recommended and for what length of time.