Ukrainian Andrey Nekrasov captured the stunning images in the Arctic Circle, Northern Karelia White Sea, Russia.
He said: "It was cold water with sub zero temperature and then there is that impossibility of getting out anywhere. There is [an] armour of ice over the diver's head."
"But it all pays off because you see the beauty that you will see nowhere else. The underwater part often has a spectacular topography and structure."
Free divers head to the White Sea every year, though ground temperatures fall as low as minus 20 degrees, and the water temperature hovers around minus two degrees.
They use 7mm wetsuits and stay in special mobile homes around the sea.
A chainsaw was used to carve a hole in the ice.
Nekrasov was tied to a safety line while he dived.
He went down to about 18 metres.
It's dangerous and time consuming: but definitely worth it.
