350
In 2025, People Will Try Living in This Underwater Habitat
(spectrum.ieee.org)
This is a most excellent place for technology news and articles.
Ocean is tough. Tougher than floating cities. Which are more realistic as real habitable environment.
I vote for Stanford torus stations in various L points.
Or, naturally, Mars.
Before that, of course, there are plenty of locations on Earth hard to live in, but not as hard as underwater domes. They should try that.