I have had this happen on 2 recent dives on separate days. Effortless descent to 95 feet and then felt a slight right chest pressure about 6 inches below the axilla. It felt just like a sinus squeeze and went away the instant I ascended about 10 feet. It did not re occur until another similar dive on a different day. I am totally healthy, in my 40s, run 30-40 miles a week and have no respiratory history. I have had normal xrays and a stress test (just for grins) in the past year. Is it possible that there was/is some non-communicating air passage there? Any suggestions?