We're familiar with the surface hunters; stranger giants thrive far below, in no sunlight, pitch black. [Music]

Like the back of an alien planet, at depths of five thousand feet, the pressure can kill—more than two thousand pounds per square

inch. Yet there is life here. A sub crew sets out bait; hungry little sharks show up at the edge of the light.

One of the world's biggest and oldest killer sharks, a bluntnose sixgill, attacks the bait. [Music]

Big as a great white, up to 16 feet long. Not a lot of fresh kill 5,000 feet down.

The sixgill is a holdover from another era, a 200-million-year-old engine that keeps on trucking.

An extra pair of gills and six rows of razor teeth—enough to take a chunk out of a whale.

[Music] This shark may look slow, but when it's hungry [Music] it's fast enough. There's power in that long tail.

Everywhere you turn is the domain of an unexpected, bizarre ocean predator. Nighttime in the abyss: the largest migration on Earth begins.

[Music] Countless creatures rise to the surface to feed. [Music] Including a monster from far below.

Enormous; a mouth big enough to engulf a human. This epic journey begins with tiny plankton.

[Applause] The megamouth is a mysterious, ancient giant, seen fewer than 100 times.

Only discovered in 1976. What we do know: it grows to over 20 feet long, a filter feeder,

like whale and basking sharks, except the megamouth lives much deeper down—to 15,000 feet during the day.

That weirdly shimmering skin is a secret weapon to engulf its favorite prey: krill and plankton, lured by the

bioluminescent glow, which it swallows with its tongue. [Music] You

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