Oneroom-Babel is the name of a structure located in the deep sea. The Korean term “Oneroom” refers to a studio apartment in which the bedroom, kitchen, and living room are not separated but integrated into a single space. “I”, whom the player controls as the main character of Oneroom-Babel and as a first-person observer, belongs to a tribal society of the distant future and is preparing for a coming-of-age ceremony that requires the youth to jump into the sea from the highest cliff in the village. Feeling anxious before the ceremony, “I” practises diving and is swept away by the sea current. “I” arrives at a fantastic coral colony considered sacred to the tribe, where “I” encounters an abandoned living space, Oneroom, submerged in the sea and covered with coral. As he explores four Onerooms, “I” experiences the emotions and stories enshrined in the place. The virtual structure consists mainly of processed data acquired by a LiDAR scanner. In harmony with music, sound, text, and graphics, this structure composes a complex, dreamlike virtual experience.