The paper: Battery-free wireless imaging of underwater environments - https://www.nature.com/articles/s41467-022-33223-x.pdf https://www.nature.com/articles/s4

The paper: Battery-free wireless imaging of underwater environments - https://www.nature.com/articles/s41467-022-33223-x.pdf https://www.nature.com/articles/s41467-022-33223-x.pdf > ..The cameras power up from harvested acoustic energy, capture color images using ultra-low-power active illumination and a monochrome image sensor, and communicate wirelessly at net-zero-power via acoustic backscatter. We demonstrate wireless battery-free imaging of animals, plants, pollutants, and localization tags in enclosed and open-water environments. > ..Here, we report underwater backscatter imaging, a battery-free wireless imaging method for underwater environments. Our method consumes five orders of magnitude less power than previously reported underwater wireless imaging systems. The ultra-low-power nature of our method enables it to operate entirely based on harvested energy.