ScienCentral.com News has published the perfect companion article to yesterday's story on the robot air force. It's a concise overview of all the new types of Autonomous Underwater Vehicles (AUVs) being developed for the US Navy. In addition to the usual "swimming" AUVs, they're working on one that crawls along the ocean floor on tank-like tracks. The story includes several photos, a video clip, and lots of links.