The depths of the world's oceans resemble outer space. The alien and strange life forms down in the darkness send the imagination soaring. We know less about life in the dark and impassable depths than any other life form on the planet. Down here, intrepid biologists work to study the unknown creatures and ecosystems that thrive in isolation.

But the days when the deep sea was the last wilderness on earth may be coming to an end. As biologists work to map life in the deep, mining companies are preparing to extract the oceans' precious resources. For the biologists, the battle against the elements suddenly becomes a battle against time.

'How Deep is Your Love' is both an adventurous journey into an unknown and breathtaking realm, and a call to respect nature - even that part of it that we rarely have access to. It's also a thought-provoking reminder that we actually live on a planet where humans are not the center of everything.