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Watch the BBC first on iPlayer https://bbc.in/iPlayerHome Over half of all animals in the open ocean drift in currents. Jellyfish cross entire oceans feeding on whatever happens to tangle with their tentacles. The jellylike Portuguese manofwar can harness sail power to fish with its deadly tentacles.

The big blue is the world's greatest wilderness, far from shore and many kilometres deep. It's a vast marine desert where there is little to eat and nowhere to hide. Yet it's home to some of the biggest and most spectacular creatures on earth.

This episode reveals what it takes to survive in this savage and forbidding world. We witness feats of incredible endurance, moments of high drama and extraordinary acts of heartwrenching selfsacrifice.

Blue Planet II | Series 1 Episode 4 | BBC One

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