When Dashi is accidentally swallowed by a whale shark, the Octonauts venture inside the huge fish to rescue her. Barnacles and Kwazii investigate a disruption on a nearby reef - a Carrier Crab and the ...

Kwazii and Dashi become entangled in a strange deep-sea creature - a siphonophore - and when a geyser blasts it toward the surface, the Octonauts must stop its ascent before it fatally bursts. Water ...