Sir David Attenborough narrates this critically acclaimed series that dives deep into the marine environment of Planet Earth. This limited series travels from various coasts to the poles to examine watery denizens ranging from the gigantic blue whale to microscopic coral polyps. Watch the whole series on here: https://www.youtube.com/playlist?list=PLsPICzNsouwdmK0SrPDWy5eY3Q-ZnBX2r