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When Dashi is swallowed by a whale shark she thought was a cave, the Octonauts venture inside it to rescue her.
Captain Barnacles informs the other Octonauts (Kwazii, Tweak, Tunip and Professor Inkling) that Dashi has been swallowed by a whale shark. Tunip asks Shellington if a whale shark is a whale. Shellington tells him that a whale shark is not a whale, but a shark (which is a fish) and the biggest fish in the ocean. Professor Inkling mentions how the fish is a filter feeder, which means it just opens its mouth and swallows whatever's there (meaning it didn't swallow Dashi on purpose). Barnacles instructs Kwazii and Peso to enter the GUP-A to go and save her. Tweak gives the captain a whale shark detector so they'll know where the whale shark is. She opens the Octo-Hatch and they go.
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