madsci1016 writes: The 18th Annual International RoboSub Competition is happening this week at the TRANSDEC Naval Testing facility in San Diego, California. 38 teams from around the world have built fully autonomous underwater robots designed to complete a gauntlet of underwater obstacles. No GPS here, advanced image processing and acoustic sensors are your only tools. The competition is open to the public from now until Sunday. A few pictures from the ongoing event can be found here.