Hardware · Climate · Health
DAIVIN!
DAIVIN! is a San Francisco deep-tech startup (Y Combinator W26) building tankless dive gear that generates breathable oxygen on demand from water. Using electrolysis to split H2O into oxygen and hydrogen, its wearable vest and battery belt let divers breathe underwater without carrying pressurized tanks - limited only by battery life. Founded in 2025 by electrical engineer and certified diver Leo Kankkunen, the company frames oxygen delivery as an energy problem rather than a logistics one, with a long-term vision spanning diving, emergency response, aviation, medicine, and space.