Sir David Attenborough will present the sequel to 2001's The Blue Planet, the BBC has announced. <br /> <br />The seven-part series, to be shown later this year, will aim to highlight recent scientific discoveries. <br /> <br />Filming innovations include suction cameras fitted to the backs of orcas. <br /> <br />"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.
