u/russmaster2299

If you have Algae submerged in water, and under light, it converts the Algae into oxygen at a rate of 20 grams a second at half efficiency. This also works for adding more Oxygen into an over pressured area (since the algae is submerged, and not over pressure).

I don't know if the feature was recently added, or if it was always around but to niche to even realize. It's still a worse conversion ratio than other algae based oxygen production tools, but it should still be noted, such as to avoid storing your Algae under water with light.