The 50-ton craft can carry as much as 20 tons of sensors or other gear and operates at depths reaching 11,000 feet. While on the surface, it downloads route instructions from human minders via satellite.
The Voyager runs on batteries, which are recharged using diesel fuel every three days during a four- to eight-hour resurfacing. With a full 1,000-gallon diesel tank, the robot can travel a total of 6,500 nautical miles—enough to swim around Australia—vs. 200 miles tops for a typical drone craft.