History Series / TheSilentSea

** The scientists of Balhae Station were apparently trying to brute-force the development of [[spoiler:an immunity to the lunar water's effects by exposing dozens of pre-teens to it, hoping one would prove to be naturally immune. Morally bankrupt, but scientifically sound - that's basically enforced natural selection. However, all these pre-teens were clones, meaning they were genetically identical, which in turn means that after the first one didn't survive the water, the others would've shown the exact same reaction. Yet Luna-073 still somehow came out on top.]]

* {{Shoutout}}: The team's handguns are quite massive, [[BottomlessMagazines hold far more rounds than should realistically fit into their magazines]], and have a side-mounted display that allows for choosing between different kinds of ammo. If they were voice-activated, they'd be [[ComicBook/JudgeDredd Lawgivers]] with the serial numbers filed off.

* SymbolicSereneSubmersion: Everyone who fell victim to [[spoiler: lunar water]], save for [[spoiler: Tae-Suk]] has had this scene.

* HalfHumanHybrid: [[spoiler: Luna]] has gills and scales that enable her to thrive in [[spoiler: lunar water. It turns out that her genetic modifications also enable her to just do fine in the lunar atmosphere. Without a spacesuit.]]

* HiredGuns: Space travel has apparently become so widely available that mercenary raids are a constant worry. The most frequently mentioned company of the sort is RX (shorthand for Resource Exploitation), a ruthless {{Megacorp}} that goes around the solar system staking claims to profitable resource deposits, or looting abandoned ([[SpacePirates or not so abandoned]]) outposts.

* DarkAndTroubledPast: Tae-Suk was the guy who (reluctantly) [[spoiler: closed the gate on the entire Balhae crew, sealing everyone to their watery deaths.]]
* DoesNotKnowHisOwnStrength: [[spoiler: Luna is merely a child yet she can easily rip a man in two if she so desired. She’s prone to acting like a child and struggling to acquire more water for herself. Rather than being a malevolent person, she’s merely trying to keep what she considers hers. Any deaths incurred by her are not intentional but the results of a normal child’s temper tantrum who just happens to have super human strength.]]

* ClassifiedInformation: Certain areas of the station are off-limits to the crew without proper security clearance, with even the blueprints omitting the existence of those areas.

* BloodFromTheMouth: The seriousness of Mr. Hwang's injury (he suffered a broken rib which, it seems, punctured a lung) is demonstrated when he suddenly vomits up a good chunk of blood into his space helmet. He dies moments later.

* IllGirl: Han's daughter; having their water status raised to treat her leg disease is what motivates him to join the mission.

* IDidWhatIHadToDo: Song Won-kyung says this from beyond the grave. She tells her sister in a video letter that yes, she created and murdered 72 clones, but she did it to solve the water problem on Earth and save the human race.

* InMediasRes: The series open with Dr. Song waking up upside down from a crash landing.

** Despite the station having maintained a breathable atmosphere ever since the accident five years earlier, none of the corpses lying around have rotted or even desiccated.

* BottomlessMagazines: The soldiers among the team fire far more bullets in a single fight than their magazines could realistically hold, and they're never seen reloading. It might've been feasible if their guns were chambered for some semi-futuristic, ultra-small high-velocity caliber, but they clearly aren't, judging by the muzzle bore and the bullets shown in the final episode.

* InformedExpert: Dr. Song, the main character, is an astrobiologist, yet somehow fails to recognize [[spoiler:gills]] when she sees them. Granted, they're not normally found on humans, but still. She also doesn't contribute much scientific know-how to solving the mysteries of Balhae Station aside from surface-level knowledge that most viewers probably deduced for themselves before her, like [[spoiler:lunar water behaving like a virus]].

* ApocalypseHow: Earth is undergoing a ApocalypseHow/Class1 Societal Disruption when the show begins, brought on by a severe worldwide water shortage. Rivers, lakes, and even parts of the oceans have dried up, fish are considered extinct, water is strictly rationed, keeping pets is illegal, riots are common, and there's a general sense of dejection and acceptance of mankind's eventual extinction. The mission to Balhae Station is supposed to fix this, and it might well succeed in doing so if done right. If done wrong, however, Earth is looking at a ApocalypseHow/Class2 at best[[note]]if enough humans turn out to be immune to lunar water, mankind might survive and be able to restore the planet's hydrosphere[[/note]], or up to ApocalypseHow/Class4 at worst, depending on how many species are susceptible.