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."

While it remains to be seen if they pull that off, again that's directed towards exploration (research) and not colonization. It's an entirely different endeavor. It's one thing to have self-selected or screened adults who are chosen for specific personality types and skill sets to spend time in an environment - even a long time. Continuing that with a second generation who will (essentially) represent a random cross-section of personalities and skills is a wholly other thing.