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The Hidden Lake is a Season 4 episode of Octonauts. 
Unnamed (13)

Storyline

The Octonauts are in Antarctica, When they find something strange, Red ice! Then it turns out something amazing! A hidden red lake. Shellington thinks there might be undiscovered creatures inside of it. Could they find something hidden under the lake?

Episode Guide

Previous: Octonauts and the Poison Dart Frogs

Next: Octonauts and the Octopod Mystery