When the ocean depths become too dangerous for a human to explore, it's time to send in the robots. Over 80% of our oceans remain a mystery. We join experts #IntoTheDeep to unveil some of its top secrets. Subscribe: bit.ly/BBCEarthSub #IntoTheDeep #Robots #BBCEarth Watch more: Planet Earth bit.ly/PlanetEarthPlaylist Blue Planet bit.ly/BluePlanetPlaylist Planet Earth II bit.ly/PlanetEarthIIPlaylist Planet Dinosaur bit.ly/PlanetDinosaurPlaylist Welcome to BBC EARTH! The world is an amazing place full of stories, beauty and natural wonder. Here you'll find 50 years worth of entertaining and thought-provoking natural history content. Dramatic, rare, and exclusive, nature doesn't get more exciting than this. This is a commercial page from BBC Studios. Service information and feedback: bbcworldwide.com/vod-feedback--contact-details.aspx