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In theory, if you go down fast enough you can have time for deco going up, but for that he would have to let go of the balloon, I guess somewhere between 40 and 20 meters. The whole thing is extremely risky. I remember when Patrick Musimu did his 209,6 meters in 2005 he acknowledged that he "did not came out uninjured", although AFAIK he never revealed the nature of his injury. One of the observations at the time was that the maximum depth for the German submarines in WWII was 180 meters. Other was that Musimu's lungs at over 200 meters would have been compressed to the size of a tennis ball. He reportedly used the technique (that I believe was pioneered by Pipin Carreras) of flooding his sinuses and Eustachian tubes, thus avoiding the need for equalization. Maybe one of this days Herbert himself will give us a more detailed idea of his plans.
It indeed seems to be the case:I think that the inflating system should not be triggered by the freediver (narcosis etc..). It should be triggered automatically for maximum safety.
With this machine, surface personnel can decide to abort a dive while it is done, by watching the sonar. So an accident can even be prevented before it happens.
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Finally, an automation add-on will make possible to test most parts, speeds, safety and emergency procedures without Herbert himself on the sled.