As a National Geographic explorer, Cameron is helping to build a mini-submarine that will descend into the darkest reaches of the sea, and in June next year plans to be one of two men who separately will pilot the single-seater sub to the depths of the Mariana Trench in the Pacific Ocean. Sala plans to explore and survey the 50 or so remaining “pristine places” in the sea “to show the world what the ocean was like hundreds of years ago...”. __