 In 1960, Jacques Piccard and United States Navy Lieutenant Donald Walsh descended in the bathyscaphe "Trieste" into the deepest part of the world's oceans, the Mariana Trench.On 25 March 2012, filmmaker James Cameron descended into the Mariana Trench in the "Deepsea Challenger", and, for the first time, is expected to have filmed and sampled the bottom.Despite these advances in deep-sea exploration, the voyage to the ocean bottom is still a challenging experience.