Looks like a lot of mining is going under the ocean with the discovery of rich gold deposits and other valuable minerals in underwater volcanoes. Also the same applys apparently with the thermal hot pools, they are just trying to figure out how to ho about extracting the minerals from these deep scary volcanic hot pools, here in New Zealand we have alot of volcanic activity so its interesting and scary to think how they would get it out of these pools. Any way thought some people might find this interesting.
https://www.newscientist.com/article/mg21128193-700-deep-sea-gold-rush-mining-hydrothermal-vents/
https://www.nzherald.co.nz/nz/news/article.cfm?c_id=1&objectid=11502829
Video showing the vents -
https://www.youtube.com/watch?v=KtFFmDGIsa4&t=46s
Quote from Al Jazeera - "The National Oceanic and Atmospheric Administration's national ocean service estimates that there is more than $150tn in gold waiting to be mined from the floor of the world's oceans. "