We like to say we know less about the ocean here on Earth than we do about the surface of Mars, because while we have a vague idea of its overall structure, we’ve only properly seen less than 0.05% of it.

Imagine we discover an alien planet that’s teeming with life, and we’ve only explored an area the size of Tasmania – that’s what we’re dealing with when it comes to the ocean. And now, thanks to this awesome deep-sea diver, we’re getting a glimpse at what’s really down there.

Roman Fedortsov is a deep-sea fisherman based in the port city of Murmansk in Russia, which looks out over the Barents Sea – a relatively shallow sea that opens into the Arctic Ocean.