On this exciting DVD, join the Octonauts as they journey to Antarctica to prevent a group of penguins from falling into an ic e 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. Enjoy these arctic adventures and more with the Octonauts!