Running time: 113 mins
Park Dong-won (Kim Sung-kyun) and his family move into a house purchased after 11 years of labor. They throw a housewarming party and invite their friends. A heavy overnight downpour creates an extremely big sinkhole, and in a mere minute, it engulfs the house with the people inside it. Deep down the hole, Park, his neighbor Jeong Man-soo (Cha Seung-won) and the guests have to find a way out. As luck would have it, rain again begins to pour down, filling the sinkhole with water. They must find out a solution before time runs out.