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Now I talked to my buddy on the phone to make sure that the first stage froze shut. It did not. There were three distinct problems, all happening at the same time. 1. There was a small continuous free-flow and he had air to breathe all the time, a little too much air in fact. 2. The temperature...

Two days ago I witnessed a free-flow while diving under ice in a mountain lake at high altitude. My buddy was wearing a Scubapro FFM. We were about 10 yards from the hole, just below the ice and the water temp was 36. His second stage was leaking air with a steady flow, not much, like...

At the time I bought that FFM gadget I had no clue about using it and had little diving experience, I only knew that I had to dive under ice. Now, six years later, I still consider it a gadget not worth using unless it is mandatory to have a continuous audio link to the surface, like in search...

I have a Scubapro FFM too, fitted with an Apeks reg. It is important to have a rig with easy acces to the tank valves. Either Hog/DIR with twin tanks and manifold or an inverted (worn upside down) single cylinder with a cage protecting the twin valves. There are other configurations as well...