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The Baby Bears build a submarine and explore the depths of an aquarium so they can bring a lost squid to its family.
The three bears while trying once again to find a place to stay get caught along with a school of fish and discover a little squid clinging to them; the squid tries to get the bears to take it to an aquarium.
- Baby Panda is once again voiced by Duncan Joiner. It appears that he and Max Mitchell are taking turns as Baby Panda's voice.
- This is the second episode that shows a "The End" title card the first episode was Planet Bears but instead of a "The End" title card this title card was the Planet Bears Title card.
- It's unknown how Baby Ice Bear can hold his breath underwater so long, he should've suffered.
- A Merlion statue is featured in the Atlantic Aquarium, referencing Daniel Chong's Singaporean heritage.
- January 7, 2019 (United Kingdom and Ireland)
- January 25, 2019 (South East Asia)