A friend of mine did work in this space back in 90s and early 2000s ("Synthetic Blood International", later renamed to "Oxygen Biotherapeutics", now "Tenax Ther

A friend of mine did work in this space back in 90s and early 2000s ("Synthetic Blood International", later renamed to "Oxygen Biotherapeutics", now "Tenax Therapeutics") based on work done by Dr. Leland Clark[0]. It sounded like really interesting stuff-- very sci-fi. They were using a fluorocarbon[1]. It made me think of The Abyss. They had a ton of interest from the Department of Defense. Edit: Oh, holy crap. I didn't realize Dr. Clark actually did the "rat breathing liquid"[2] thing for real! (It sounds cruel, to be sure...) (Also, Dr. Clark had some serious Isaac Asimov sideburns going on...) [0] https://en.wikipedia.org/wiki/Leland_Clark https://en.wikipedia.org/wiki/Leland_Clark [1] https://patents.google.com/patent/US4289499A/en https://patents.google.com/patent/US4289499A/en [2] https://cen.acs.org/articles/83/i13/LELAND-CLARK.html https://cen.acs.org/articles/83/i13/LELAND-CLARK.html