It's a day out! Duggee and the Squirrels are off on an underwater adventure with Betty's dad in his submarine. They see all the wonders of the underwater world, including a giant sea stallion and some jazz fish. And to the Squirrels, all those coloured buttons that work the submarine are just as interesting as what is outside. Betty's dad has a tricky time amusing the Squirrels. Thank goodness for the school of fish!
Cast Appearances

Alexander Armstrong
voices Narrator
Sander Jones
voices Duggee
Jasmine Bartholomew
voices Betty
Duke Davis
voices Happy
Leo Templer
voices Roly
Alfie Sanderson
voices Tag
Poppie Boyes
voices Norrie
Sean Orchard
voices School of Fish
Frankie Green
voices School of FishEpisode Discussion
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