Subject: Re: To infinity and beyond
"DEEP’s Sentinel subsea habitat system radically expands human access to the ocean. Sentinel fills a technology gap unserved by diving or submersible methods, allowing people to live and work underwater for longer periods and unlock new discoveries."

https://www.deep.com/

Pretty cool. I couldn't tell whether this modular undersea habitat system has to be on the sea floor or not, but if it only has to be anchored to the sea floor, while remaining, say, 150 ft below the surface, it could provide a partial solution to rising sea levels robbing us of coastal living space. But, even 150 feet down, leaks could still be catastrophic.