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RE: First Aid Class
When I first learned, it was, as I recall, 15 compressions, then breath, do this on repeat for two minutes, check for pulse, repeat. Then yeah, just compressions.
I don't know that breaths do much for their oxygen levels though, since we're breathing out CO2, hey?
We don't exhale pure CO2, there is quite a lot of unused
O2 in what we exhale. You can use a 'rebreather'
To stay underwater and not leave a trail of bubbles, breathing
Your own exhaled air with the CO2 scrubbed
Out. Military technology. We used them for emergency
Escape in the missile silo's where I worked.