During the filming of the famous Blue Planet 2 series by David Attenborough, the viewers got a unique insight into how little our oceans have been explored. Using a Triton submarine, the team of researchers was able to dive 1000 m below the surface, in an area known as the "midnight zone". Here, the cameras discovered the body of a 30-ton whale, which had sunk from the surface and became a food for the creatures of the deep.
However, there was a visitor during the four months they filmed, which left the team perplexed.
David Attenborough said in 2017: "There is nothing left but a few bones.
"But they are even food for something.
"Zombie worms: enter the bones by injecting acid and can reach the tiny amounts of fat that still remain there.
"It may take decades, but over time, the last of the bones will collapse and the entire 30-tonne shell will have been recycled."
"A whale fall is a temporary oasis in the desert of the seabed."
Also known as Osedax, or bone worms, these creatures got their name because of their ability to revel in the bones of a corpse.
Lacking stomachs and mouths, Osedax trusts symbiotic Species of bacteria that aid in the digestion of whale and lipid proteins and release nutrients that worms can absorb.
They have colorful feather feathers that act like gills and unusual structures similar to roots that absorb nutrients.
However, they are not the first remarkable discovery that comes out of the ocean and is captured by Sir David's team.
Just 200 m above this strange find, in an area known as the "twilight zone", a cannibal was captured in a movie.
Sir David said: "Humboldt squids: two meters long and 50 kilos in weight.
"Like most squids, they are voracious hunters.
"There are hundreds of them and they have found a shoal of fish hidden 800 meters from the coast of South America.
"Its tentacles are armed with powerful shoots with which they grab their prey."
The 92-year-old presenter then revealed how this huge squid will become a cannibal to survive.
Sir David added: "When no more lantern fish are found, they light up against each other.
"This squid has caught a smaller one in its tentacles.
"To hide his capture from the rest, he throws a smokescreen of black ink.
"But then, an even bigger one challenges him and steals his capture.
"The penumbra area is the favorite hunting ground of the Humboldt squid, they rarely deepen."