This is a Canadian mining company that discovered it by partially finding a researcher to investigate. After about 8 years, their researchers literally said "we're forced to conclude that this was caused by the above."
The mining company was not happy, the CAD government put a moratorium on mining for further research, and now the company is paying to have other research completed cuz they "dispute his findings" ๐ I'll see if I can find the article
Edit: the article. https://www.cbc.ca/news/science/oxygen-ocean-study-conflict-1.7273929
This falls in the list of things I didn't know I didn't want to know, but now know, and know I don't want to know. Oh no