Hyperbaric chamber generates a lot of noise. For me pressure 1.6 ATM was ok. For some people hyperbaric chamber is helpful, for some not regarding tinnitus.
Yes helped for tinnitus in my right ear. I am better now after HBOT than before. But unfortunately my tinnitus is very reactive and HBOT did not help for tinnitus reactivity and hyperacusis.
So after even not so loud noise my tinnitus spikes. Anyway last 3 nights I slept well (of course with help of melatonin and herbs), Tinnitus seems to be less bothersome now than before HBOT but it is still present all day and night.
It seems is best to take HBOT just after accoustic trauma or spike. For me HBOT was helpful but I know 1 person who claims it did not help her.
In my case helped for my recent spike. Difference was in right ear, in left seems no difference.
Your profile says you've had tinnitus since 2018, the word on the forum is that HBOT is better in the first 2 weeks. Did you had a new acoustic trauma or why did you decide to try it this much time after onset?