For the last 8 years, James Cameron has been building a secret submarine in Australia that will transport him to the Challenger Deep, otherwise known as the bottom of the Marianas Trench and earth's deepest crevice. Cameron innovated the Deepsea Challenger to function as a vertical torpedo, which will maximize his time on the ocean's floor during his solo trip. By the time he reaches the bottom, Cameron will be alone, 6.8 miles below the earth's surface and barely able to move due to space constraints. If all goes according to plan, Cameron will be able to explore the bottom for 6 hours, during which 8 tons of pressure per square inch will be exerted on his vessel. While 12 men have walked on the moon, only 2 have ventured to the Challenger Deep.