Alternate Air Source
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This is why we always dive in buddy teams:
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if the diver has an equipment malfunction or runs
out of air and does not have a RASS to perform
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their dive buddy will be there to rescue them.
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One way to do this is to use your alternate air
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At NOAA we use the Atomic SS1 as an
alternate air source/inflator. We often refer to it
as the Atomic.
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When using the Atomic, the donor breathes from
their alternate air source and passes off their
primary regulator to the out-of-air diver.
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Here, the diver on the right has run out of air.
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The diver on the left is the donor and offers up
their primary regulator.
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Both divers go to proper hand positions.
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Let's look at where the Atomic is. In the case of
the donor, on the left hand side, the donor's
breathing from the Atomic
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and the donor can also add or subtract air from
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The recipient, the person out of air,
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has their inflator high up above their left shoulder
because, as they make an ascent,
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they may need to vent air from their BC as they
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Also when they get to the surface, they need to
find their alternate air source inflator so they can
orally inflate their BC.
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So here we see the right hand - it's right hand to
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And looking straight down you see the hook up.
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It's an open box in the middle. there are no
crossed arms. both divers are facing each other.
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Once the out-of-air situation is solved and you
get a breathing rhythm going
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both divers ascend to the surface.
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Now, for the person out of air, it's not a free ride!
You have to kick as well.
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The donor is not just going to inflate their BC
and drag you to the surface.
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Both divers have to kick to get to the surface.
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When you get to the surface,
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the person that is out of air is going to have to
orally inflate their BC.
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So when they get to the surface, they have to
kick hard and orally inflate their BC.
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The donor keeps the regulator in their mouth -
that's the Atomic -
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fully inflates their BC and provides positive
buoyancy for the person that's out of air.
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So watch as they come to the surface.
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Here is the second view.
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The donor on the left keeps the regulator in and
their BC is fully inflated.
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The recipient, on the right, has to orally inflate
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Once both divers are positively buoyant, the skill
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