Octonauts· Season 3 · Episode 5The Humpback WhalesS03E05·September 10, 2013·11m·CBeebiesWhen a sardine swallows the key to a treasure chest, a humpback whale helps Kwazii track it down.Streaming on (US) See allSharePreviousThe Artificial ReefS03E04NextThe PelicansS03E06Keep goingSeasonSeason 3 ranked & reviewedEvery episode in airing order with ratings and dates.StreamWhere to watch OctonautsEvery streaming service and region, checked around the clock.MatchupShows like OctonautsThe closest matches, ranked by overlap and rating.
