The Octonauts race against time to rescue Tweak's pal, a Leatherback Sea Turtle who's caught in a fast-moving ocean current that's sucking it into a whirlpool.

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 ...