Academy Award-winning director and ocean explorer James Cameron speaks in front of the one-person submarine he helped developed, “Deepsea Challenger”, as it is displayed it in front of the US Capitol in Washington, DC, yesterday. The sub, which he used to explore the Mariana Trench and is the only human-occupied vehicle currently capable of reaching the deepest parts of the ocean, is on a cross-country journey to Woods Hole Oceanographic Institution in Massachussetts, where it has been donated.