I had high expectations but the length (at least 1/3 too much) and the biological/physical nonsense heavily damaged watching this series.
I liked the idea of discussing the future of water, which covers most of the world today, makes up most of the human body, and was even understood as a principle in the formation of the universe in early Greek philosophy, and is threatened by human activities. I liked the experiment on the goldfish. I liked the clashes of interests regarding the mission on the Moon.
In my eyes, showing how lunar water had been identified, then mined, leading to the establishment of the base, would have improved the production.
The problems now.
The plot is meaningless as - even accepting the biological impossibilities presented - the company interested in putting its paws on the resources in the base could have just sent its own craft and crew. There was no need to infiltrate the space agency mission.
The plot is - separately - meaningless because of the many impossibilities presented:
1. One can't see a virus using the microscope used,
2. and can't even see a bacterium unless one prepares the bacterium by first staining it.
3. Genetic modifications in one biosystem cannot become antibodies in another one.
4. The girl would have died of starvation,
5. and if she had exited the base, would have immediately frozen to death and be without breath.
6. Water cannot replicate as reported.
Et cetera, et cetera, et cetera.
The writer(s) should have consulted KAIST and/or some other group/institute to mitigate the nonsense in the series. Bae Doona could have done chromatography on the water, investigated the plants, worked under hoods, irradiated/autoclaved stuff, and she would have realized if liquid water exists inside the base, parts thereof would exist as water vapor and thus cause the same effects as the liquid, ...
Now "The Silent Sea" will negatively affect me watching "Stranger 3" (if it comes out), since Bae Doona would have the leading female role (like in "Stranger" and "Stranger 2").