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You are presuming they are breathing off the tank. The marketing and sales is for untrained people, not those who have takes any scuba classes. The risk does exist, go down, maybe something simple like fetching dropped car keys that are deeper than they would normally snorkel to. Hay, I get an extra breath in this new toy but I better save it. Swim down and hit that 25' bottom and pick up the dropped sun glasses. That was a bit far so they take a single breath off there bottle and head for the surface. Still thinking it's a snorkel with an extra breath in it. Holding there breath all the way to the surface. That is where these things will kill people. Anyone who has had a basic scuba class, and I will throw in those quicky one day resort dives as well, has had the "don't hold your breath" lesson. They are probably going to be OK if they remember that. Those who know nothing about the physics of diving are the ones who will be dead. Almost everyone here will know the physics of diving, or are hear to learn about them. This isn't the crowd to worry about.Only if you hold your breath, which is unlikely since you are breathing off a tank. Bye to you too.
Probably quality control during manufacturingIs there any difference between this SMACO scuba diving tank and the famous Spare Air ?
They seem to be the same thing.
How deep can you free dive before you should take the first breath? Can you dive to 30 feet and then start using it?