fair point re depths and pressures, although I'm sure that some no limits sledges are lifted by balloons?? Of course, the freedivers saftey vest size balloon would not work at those depths. I can't get out of my head the idea of trying out (just for fun!) a car airbag unit at depth. They should be cheap from the wrecking yards, and just need a 12V buzz to fire.. I know the duration would be a problem... like I said, a fun experiment.
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