The Silent Sea hit Netflix on December 24, 2021, and its eight-episode run makes for a strong follow-up to The Expanse. It has that same near-future plausibility, but the show leans harder on mystery, with a believable human crisis at the center, a dangerous mission, and secrets that only get worse the deeper the crew goes.
Released on December 24, 2021, The Silent Sea expands on director Choi Hang-yong’s 2014 short film The Sea of Tranquility. Where The Expanse works on a sprawling political scale straight out of James S.A. Corey, this story stays much tighter. It’s set on the abandoned Balhae lunar research station, where a handpicked crew is sent to investigate an earlier disaster in a dystopian future shaped by desertification and catastrophic water shortages.
Inside the base, the crew uncovers the truth behind “lunar water,” a substance that seems like it could solve Earth’s crisis because it multiplies on contact with living organisms. The problem is that it’s lethally unstable, and its victims drown from the inside. That’s what gives The Silent Sea its identity as hard sci-fi, survival thriller, and conspiracy story all at once. The tone is far more claustrophobic than The Expanse, with clear echoes of Alien and Interstellar. The themes are familiar too: scarcity, inequality, secrecy, and the ethics of scientific research. The show also had the numbers to back up the attention, with 47.8 million hours watched and a Top 10 ranking in 77 countries, including No. 1 in six of them, according to Netflix. Even now, as of late 2026, there’s still no confirmed season 2. If you’ve been missing serious sci-fi, The Silent Sea is worth your time.
You can watch The Silent Sea on Netflix.
Author: Jesús Bosque
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