The real-life adventure, as opposed to the ones Cameron has created in films such as “Avatar” and “Aliens,” will see Cameron travel seven miles (11.2 kilometers) below the ocean’s surface, where he will collect research samples for marine biology and geology. The lowest point of the Mariana Trench, known as “Challenger Deep,” has been reached only once before in 1960 when US Navy Lt. Don Walsh and Swiss oceanographer Jacques Piccard spent 20 minutes there in the bathyscaphe Trieste. Cameron plans to spend six hours there. “The deep trenches are the last unexplored frontier on our planet, with scientific riches enough to fill a hundred years of exploration,” Cameron said in a statement. The exploration is a joint project by Cameron, the National Geographic Society, and watchmaker Rolex that is being called the “Deepsea Challenge” and is designed to expand knowledge of unknown portions of Earth. Cameron’s submersible represents breakthroughs in materials science, structural engineering and imaging through an ultra-small, full ocean depth-rated stereoscopic camera.