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  • NARRATOR: The Bermuda Triangle contains some of the deepest

  • trenches in the world.

  • The Puerto Rico Trench at the Triangle's southern point

  • reaches depths of over 27,000 feet.

  • But Dr. Gallagher suspects that Mabel may frequent the Tongue

  • of the Ocean, a steep underwater trench

  • less than a mile away from Rose Island.

  • The deepest branch of the Great Bahama Canyon,

  • it's named for its shape that's like a tongue.

  • The Tongue of the Ocean drops off steeply just half a mile

  • or so offshore.

  • Goes from about 30 feet to 300 to thousands really quickly.

  • We really have no idea what's going on

  • down in the deep trenches here.

  • Anything could be happening in the deep sea.

  • It's one of the final frontiers for human exploration,

  • even more interesting, in my opinion, than exploring space.

  • JOE ROMEIRO: So animals of all sorts

  • can live within this trench.

  • And it seems like there's reports

  • of all kinds of different creatures living

  • within the tongue of the ocean.

  • It's sort of become this legendary spot.

  • NARRATOR: If Mabel is in the Bermuda trenches,

  • she may not be alone.

  • Once thought to be a barren zone with few lifeforms

  • able to sustain themselves without the sun's light,

  • marine biologists have discovered that the deep waters

  • of the Bermuda Triangle are home to other sharks,

  • from the megamouth to the sharpnose sevengill.

  • Among the diverse shark population in the depths

  • of the Bermuda Triangle, one small shark stands

  • out for its audacious attacks--

  • the cookiecutter shark, a terrifying shark

  • with a deceptively sweet name.

  • SPEAKER: Cookiecutters have very distinctive.

  • Their teeth are actually fused together.

  • Each individual tooth is fused together, unlike what

  • you see with other sharks.

  • NARRATOR: This rarely photographed shark makes

  • dramatic vertical migrations.

  • During the day, it dwells in depths over 3,000 feet.

  • But at night, it rises up over 2,000 feet to hunt.

  • SPEAKER: If you look on the underside of a cookiecutter

  • shark, it actually has cells that produce light,

  • what's called bioluminescence.

  • When a predator sees the bioluminescence in the water,

  • it goes over to it to see if anything has been disturbed.

  • A cookiecutter shark uses this opportunity

  • to latch onto the side of these predators

  • and take a bite from it.

  • NARRATOR: The cookie cutter only grows to 20 inches,

  • yet it has the audacity to attack whales,

  • tuna, even great white sharks.

  • The proof is in the telltale injury

  • the cookiecutter leaves on its victim--

  • a hole in the skin about this size and shape of a cookie.

  • If you ever looked at how they get

  • cookie dough out of something, it's with a scoop.

  • And that's basically what these sharks do.

  • They have this jaw structure that

  • can latch onto the side of an animal

  • and like scoop out a piece of flesh.

  • NARRATOR: The cookiecutter shark spends

  • its days deep in the ocean.

  • But even at shallower depths, these sharks can be

  • extremely difficult to locate.

NARRATOR: The Bermuda Triangle contains some of the deepest

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