Dong-won finally bought a house after 11 years of saving, but his happiness was short-lived. During his housewarming party, a massive sinkhole swallowed the entire apartment building, trapping him and his guests 500 meters underground. With heavy rain pouring down and the water rising fast, the survivors must come up with a crazy plan: turning a rooftop water tank into a submarine. Witness this thrilling survival story about family, resilience, and finding hope in the darkest abyss.
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