I had only one swb in over ten years of diving. It is not a surprise that it happened when I started experimenting with hyperventilation before the dives. I was coming up after a long and deep dive and I clearly remember making it to the surface. I lost consciousness without any notice or warning and regained consciousness after an interval I can only assume was around 1 minute(?). I was a few feet underwater cramped, disoriented and drinking water. I remember trying to figure out which way was up and how blurry my vision was. With tremendous effort I managed to kick to the surface and breathe for my life.
It took barely a minute to feel as if nothing had happened.
I was careless and did not observe rule #1 of freediving: NEVER dive alone.
My 2 cents of advice is if you want to keep diving for many hours try to prepare for each dive with as little hyperventilation as possible and pace yourself so that you allow for recovery between dives.
Hydro
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