The Mighty Thor
Contributor
I was training this weekend and wearing an Interspiro AGA mask. I have only used this mask about 4 times. During the first check, my mask was tightened. It was very snug. I checked my mask and it seemed to breath fine, although a little more resistance than what I was used to. When I got in the water and closed the ambient valve, I had a real hard time breathing and had to thumb the dive. It felt like the tank valve was closed, however when I returned to shore and the valve was checked, it was fully open. I loosened my mask and it breathed much easier and seemed to resolve the problem. I was also wearing a neoprene hood. Anyone have any insights?