Octonauts. Operation deep freeze

Summary/Review: Join the Octonauts as they journey to Antartica to prevent a group of penguins from falling into an ice chasm. Come along with Captain Barnacles as he teams up with his niece and nephew, Ursa and Orson, to rescue walrus pups. And when the Octonauts explore a hidden lake sealed by ice for millions of years, Shellington discovers microscopic creatures still living under the ice.