For thousands of years, shoals of herring had gathered in the small bays of the North Atlantic coast. Now, the picture is a little different as underwater cameraman Ken O'Sullivan continues to search for these fish. Will this dive be the one where he spots them? Subscribe: bit.ly/BBCEarthSub #NorthAtlantic #TheDarkOcean #Herring Watch more: Best of BBC Earth 🌍 bit.ly/BestOfBBCEarth Best Animal Fights 🥊 bit.ly/BestAnimalFights Videos over 10 minutes ⏰ bit.ly/3SHJCEJ Planet Earth III 🌍 bit.ly/PlanetEarthIIIPlaylist Frozen Planet II ❄️ https:/bit.ly/FrozenPlanetIIPlaylist Blue Planet II in 4k 🌊 bit.ly/BluePlanetII4kPlaylist Taken from 'North Atlantic: The Dark Ocean' (2023) Inspired by the Irish ancestors that ventured before him, underwater cameraman Ken O’Sullivan explores the dark depths of the North Atlantic – and immerses the viewer in the mesmerising world of marine life exploration. He addresses the urgent struggle to conser...