# 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.

- **Founded:** 2025
- **Headquarters:** San Francisco, California, United States
- **Founders:** Leo Kankkunen (Founder & CEO)
- **Team size:** 1
- **Products:** SPRING, Electrolyzer vest, Battery belt
- **Notable:** Accepted into Y Combinator's Winter 2026 (W26) batch, Launched via Launch YC as tankless underwater breathing technology, Founder is the youngest person in Finland to earn the highest national electrical certification

## Products & services

- **SPRING** — Described as the world's first tankless diving technology - a wearable system that generates breathable oxygen from surrounding water via electrolysis, with no pressurized tank.
- **Electrolyzer vest** — A lightweight vest housing triple-redundant electrolyzers that split water (H2O) into breathable oxygen (O2) and hydrogen (H2) using DC current, enabling dives to depths around 200 meters / 650 feet.
- **Battery belt** — A lightweight battery belt that replaces the traditional diving weight belt and powers the electrolyzers; includes a palm-sized emergency battery providing up to one extra hour of breathing and can be recharged via solar.

## Achievements

- Accepted into Y Combinator's Winter 2026 (W26) batch
- Launched via Launch YC as tankless underwater breathing technology
- Founder is the youngest person in Finland to earn the highest national electrical certification
- Designed a quadruple-redundant life-support architecture with three independent paths per electrolyzer

## Latest updates

- **2026-01** — Raised a $130K seed as part of Y Combinator's W26 batch.
- **2026-01** — Public Launch YC debut of tankless underwater breathing technology.

## Links

- Website: https://daivin.tech
- LinkedIn: http://www.linkedin.com/company/daivin
- Twitter/X: https://x.com/DAIVIN_TECH
- YouTube: https://www.youtube.com/@DAIVINTECH

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Profile page: https://yespress.io/daivin-yc-w26
Published by YesPress — https://yespress.io
Last updated: 2026-07-31