Underwater robot Sentry powered by 1000 lithium-ion batteries completes first seafloor survey mission
...Sentry capable of diving as deep as 5,000 meters (3.1 miles) into the ocean, has successfully completed its first scientific mission, the U.S. National Science Foundation reported on Wednesday. Sentry is a state-of-the-art, free-swimming underwater robot that can operate independently, without tethers or other connections to a research ship....
