The older kind was better because the breathing tube outside of the mask preventing the Carbon dioxide to enter the mask so that we are not inhale it again. Carbon dioxide can make someone that breathe it faint or even pass out and water is not the best place to pass out or faint.
RE: Warning: One-piece snorkel sets may be killing people. If you go snorkeling, use the older kind! Contributed by @mahalo
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Warning: One-piece snorkel sets may be killing people. If you go snorkeling, use the older kind! Contributed by @mahalo