Rangos Omnimax Theater at the Carnegie Science Center, One Allegheny Ave., North Side, is showing "Volcanoes of the Deep Sea," "Mysteries of the Great Lakes" and "Under the Sea," plus at limited times "The Polar Express." Omnimax is not recommended for children younger than 3. The science center is closed because of the Steelers games on Dec. 20 and 27. Tickets for most films are $8 for adults and $6 for senior citizens and children. "Polar Express" tickets are $10 for adults and $8 for senior citizens and children. Call 412-237-3400 for show times.