While Coconut, Matilda, and Oskar were exploring the deep sea to rescue their friend Onion, they were able to see how mysterious these underwater worlds are and how many things are still to be discovered. That's why they set off once again into the deep sea. Which animals inhabit this area? Are they specialized for this environment? How do they cope with darkness? How do they navigate? These and other exciting questions are clarified and answered here.

For the little listeners, Matilda collects the answers to these questions and many vivid images in her notebook, the booklet. Read in a multi-voiced manner by Philipp Schepmann. With great learning songs to sing along!.