The BBC will air a sequel to its critically-acclaimed 2001 documentary series 'The Blue Planet' this year, and it'll be filmed in 4K and narrated by Sir David Attenborough.
The seven-part series follows the enormous success of 'Planet Earth II', itself a sequel to another BBC documentary series.
"I am truly thrilled to be joining this new exploration of the underwater worlds which cover most of our planet, yet are still its least known," Sir David said in a statement.
The series has been four years in the making. The BBC's Natural History Unit filmed in the waters off every continent and in every ocean, with support from marine scientists.
James Honeyborne, the series' executive producer, said: "The oceans are the most exciting place to be right now, because scientific discoveries have given us a new perspective of life beneath the waves.
"'Blue Planet II' is taking its cue from these breakthroughs, unveiling unbelievable new places, extraordinary new behaviours and remarkable new creatures. Showing a contemporary portrait of marine life, it will provide a timely reminder that this is a critical moment for the health of the world's oceans."
So what can we expect in the new series? Highlights include a tuskfish that uses tools and a new species of crab with a hairy chest nicknamed the 'Hoff crab' after 'Baywatch' actor David Hasselhoff.
'The Blue Planet' was watched by more than 12 million people when it aired in 2001. It was recently announced that 'Planet Earth II' will be released on 4K Blu-ray, and have its own series of short episodes on messaging app Snapchat. Expect 'Blue Planet II' to get similar multi-platform treatment.