great Ideas. I was deep in thought about this as well after Loic's sad death. I think the problem is budget related. Freediving is still a new, "weird" sport (not my words, but what I see reflected in the comments of others I explain it to). There are no huge budgets or sponsors. Least for training dives as was Loic's.
The mechanical version, ropes, pulleys etc you mention is great. But my solution would be similar to the freediver safety vest (search this forum): an emergency buoyancy device, triggered by the diver, or from the surface. It would of course, have to be a completely separate unit to the main dive infrastructure. In both deaths, Audrey and Loic, the surface crew were aware that something was wrong, due to the time, but could do nothing to help. Some electronic progress monitoring of the diver would be great.
I have to be fair in stating that I have never tried no limits dives, nor have ever seen one. But I am an engineer, and can solve problems, and feel that these type of deaths have a technological prevention on hand. Lets hope so.
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