Day 3 at 2900 m depth is mainly for analyzing gas and isotope geochemistry. @davidbekaert.bsky.social brought a mass spec and colleagues from @whoi.edu and @ethz.ch are collecting ancient brines in pressure vessels. #darkoxygen @mblscience.bsky.social @hfspo.bsky.social #OxyMoRon #NASA #deeplife 🧪⚒️