Last month, Triton, a start-up claiming to have created "artificial gills" that let divers breathe for up to 45 minutes underwater, launched a crowdfunding campaign on Indiegogo, and amassed nearly $1 million in funding. Three days ago, it fully refunded all of its backers, canceled that campaign, issued an update and proof of concept video, and then launched a new campaign. The issue? It seems Triton's claims that its simplistic-looking "rebreather" could filter out enough oxygen from water using filtration alone were shaky at best and came under scrutiny from scientists who dismissed the highly desirable tech as fictitious. According to one researcher, in order for the Triton to properly work and extract gaseous oxygen, it'd need to have an inbuilt pump push a large amount of water through its filters. That's not something swimming alone could achieve.