The series is divided into seven main episodes, each focusing on a distinct marine habitat:
The series gained worldwide acclaim for several "first-ever" filmed behaviors: Blue Planet II
: Tuskfish that use coral "anvils" to smash open clam shells. The series is divided into seven main episodes,
: Giant trevally leaping out of the water to catch low-flying terns in mid-air. Blue Planet II
: The discovery of a new species of hairy-chested crab, nicknamed after David Hasselhoff. Episode Guide
: Broadclub cuttlefish that use flickering skin pigments to "hypnotize" and stun crabs.
: A female kobudai that undergoes a biological transformation to become a male.