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When diving rebreathers, you really don't want to rely upon standard,
old-technology snorkels when the dive boat captain leaves early after
finishing his fifth of Old Grand Dad, stranding you and your buddy in the
middle of the South Pacific.

That's why we invented the "Rebreathing Snorkel".  It is truly Hogarthian,
in that it uses only one 23' hose attached to two mouthpieces, one on each
end.  You take one end in your mouth, and your buddy takes the other.  As
you exhale, he inhales, and vice-versa.

This is where Rule #1 comes into play.  If you're in violation of Rule #1,
your buddy will try to inhale when you're inhaling, resulting in your
eyeballs being sucked back into their sockets, a potentially dangerous
situation.  Conversely, he may exhale when you exhale, thereby exploding
both divers set of lungs, resulting in pulmonary embolism.

This is why me and my team practice this technique every single dive.  If
we notice some weenie wearing a neon-pink open circuit snorkel, we dump him
overboard after giving him the "Check your ppO2 sign".

The above technique works so well, I'm told, that the USDCT has applied for
a permit to use it when they break all existing records in the Florida cave
system - the only difference is that they will be using a 900 foot hose, so
they can get past restrictions.

Kevin.
HeyyDude

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