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Through cutting-edge CGI, National Geographic explores the potential effects of sea level rise on our civilization over the next few centuries. Earth Under Water explains the science behind the prediction of sea level rise and shows what will happen if the levels rise with increasing speed. Then, we fast forward to the twenty-third century to see how resourceful humans fight back and adapt using hyper engineering, vast dams, and even the construction of floating cities to cope with the after-effects.

How to Watch National Geographic Earth Under Water Legally and Safely

If you want to stream National Geographic Earth Under Water through reputable and legal services, there are a few good options depending on where you are. Subscription platforms like HBO Max, Disney+, Netflix, Amazon Prime Video, and Apple TV+ sometimes carry National Geographic Earth Under Water films or related DC titles—though availability depends on your country.

If you’d rather not commit to a subscription, there are ad‑supported, free (but legal) platforms such as Tubi, Pluto TV, Peacock or Crackle (where available in your region) that occasionally host superhero films.

Lastly, don’t forget about library‑linked streaming options like Kanopy or Hoopla (if your library or university is registered), and official uploads by film distributors on YouTube—these can also give you legal access to classic movies.