By then most backers would have either forgotten or succumbed to "attrition" and these con artists would be sitting on money stashed up in secret Swiss bank accounts (unless they actually tried to at least make it happen and hired engineers and bought equipment). If backers are lucky, they will post regular updates for 1-2 years, showing "progress" and maybe some prototypes or various "scientific-looking" data or photos of lab equipment, and then eventually say they can't deliver. they will just pay some people for a few years and squander it all away when they give up. To play Devil's advocate, if they are actually deluded into thinking that with enough money thrown at the problem they could actually hire the right people to make this thing happen. Of course, we are all making the assumption that they are simply scamming the public. and the possible consequences or criminal liabilities are ZERO. And they have met goal, and they have (as of this post) around $340,000. IndieGogo/Flexible Funding = They can take your money no matter whether they meet goal or not. And speaking of rebreathers, I just noticed their campaign says "re-breather" in the title, but it doesn't appear to be designed to store and return any of the air you exhale and there are tons of bubbles in the photos. I believe those rebreathers can last for quite a long time as I'm pretty sure I've heard of cave divers using them and staying under for a day or more, so that would be the metric to beat. The question though is how much power you'd need and if present battery technology would be capable of sustaining it for any period of time. I assume you get 1L of oxygen per 1L of water? Or is it 1/2? Either way, seems like something that maybe you could achieve in a device that straps to your back and is the size of the rebreather in the Wikipedia article. But that article says around 4L per minute of oxygen is required for someone exercising. But with a closed system you could recycle the CO2 to bring the concentration down to a safe level. If you used a closed-circuit system like a rebreather, perhaps it could be made to work? The problem with electrolysis, besides it likely being extremely difficult to do on seawater, is that it produces pure oxygen - which is poisonous. Analysis here: Still, I wonder if it might be one day possible to create a product like this using electrolysis and a large battery pack strapped to your back. That would require over 200L of water to pass through the gills per minute even if they have designed a filter that can separate oxygen from seawater. if it weren't physically impossible to extract that much oxygen from the water through filtering.
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