
Photo: Mark Thiessen/National Geographic
James Cameron wants to dive to deepest part of the ocean – the Challenger Deep in the Mariana Trench, 35,800 feet (5.8 nautical miles) below the surface. To do so, he plans on using a single person submersible designed to dive straight down, described as a vertical torpedo. The experimental craft, built in secrecy in Australia over eight years, also rotates on a vertical axis like a bullet fired from a rifle (although much more slowly) as it dives. The intent is to minimize the dive time so as to maximize the time on the bottom. It sounds like a great idea, provided Cameron can bring the sub to a stop at the appropriate moment.