This is the Guardian.

Today, as the world looks for ways to become greener,

mining companies are arguing that the answer is at the bottom of the ocean.

The depotion is the least known environment on earth and by some accounts, even less known than space.

If you were to dive down, most likely in a submarine that's

being reinforced because it's very high pressure down there.

Steadily get darker and darker in the middle level is where you get most of the species that we know of,

the fish that we eat and so forth.

And then when you get really low down, depending on the area, you might start to see this whole different world of life.

There's some really weird and wonderful, beautiful creatures down there, including pale ghost

octopuses, tennis ball size, zenify a force.

You would see lights flash past you of humpback black devils, which have their own built in lanterns.

And people who've gone down that far often come back saying that they expected utter darkness

and found it was incredible that there were undersea displays of living fireworks down there,

because biologists think there might actually be more bioluminescent creatures down in the deep sea

than there are any kind of other species on land.

So it's phenomenal the amount of life that's down there in colour and light.

The Guardian's John Watts has been reporting on the fascinating living creatures of the deep ocean,

and it's surprising natural features too, like the growths that formed deep on the seabed

called polymetallic nodules.

They look kind of like the trunks of elephants coming out of the ground.

They're formed over thousands, maybe even millions of years, and they are home to different

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