The Seaqrium exhibition centre of the National Marine Biodiversity Institute of Korea in Janghang-eup, Seocheon, has a small marine 3D theatre in addition to the exhibition galleries. According to the centre's official cinema guide, it seats 44 people and shows short, immersive ocean-themed films lasting about 12 minutes. Tickets cost KRW 1,000 per person and are issued on the day on a first-come basis, rather than being guaranteed as part of a regular gallery ticket.
The morning programme, 'The Deep', is listed at 09:40, 10:20 and 11:00. In the afternoon, 'Splash and Bubbles' runs at 13:30, 14:15, 15:00, 15:45 and 16:30. The operator's page presents these as its current daily screening schedule, not a dated one-off festival. Equipment checks or operational changes could still affect an individual visit, so confirm the programme at the ticket desk.
There are separate safety-related admission limits. The official theatre guide excludes children under 36 months and pregnant visitors. Do not transfer the rules from the Seaqrium children's play area—such as its own free entry or height condition—to this 3D cinema; they are different facilities with different entry requirements.
The KRW 1,000 theatre ticket is separate from Seaqrium's ordinary gallery admission. The museum's current visitor guide lists adult admission at KRW 3,000 for ages 19–64, teenagers KRW 2,000 for ages 13–18 and children KRW 1,000 for ages 5–12. General exhibition hours are 09:30–18:00, last entry 17:00, with closures Mondays, January 1, Lunar New Year and Chuseok; after a Monday public holiday it closes the next weekday. Check any concessions and available cinema seats locally. Cinema enquiries: +82-41-950-0695.