Silent Sea is a silent sci-fi masterpiece. If you enjoy Sci Fi and suspense, and games like dead space, alien, doom etc, then you will enjoy this series. Some scientific and technical aspects are ignored in favour of drama and suspense, but if you immerse yourself those little things are inconsequential to the story as a whole.
A lot of people are comparing this series to Squid Game and Hellbound, as if it's the only Korean content out there. Don't listen to these people. The genre is not for everyone. This series is right up there and is at the level you expect from Korean content from way back when. It's slower paced compared to the above, but that's because of the suspense element and adds to the storytelling. The story unfolding is worth sticking around for.