The startup company Smartmedic and a team of researchers of Kaunas University of Technology (KTU), Lithuania developed a smart life-collar prototype which inflates once in contact with water thus keeping the head of its wearer above the surface. Buddy, the Life-Collar can be vital for parents of young children, who are still not confident in water.
https://en.ktu.edu/news/smart-life-collar-created-by-lithuanian-scientists-will-save-lives/
