This article on New Scientist talks about a Eurodocker (google translation). Eurodocker is a power station home base for robotic submarine AUVs (Autonomous Underwater Vehicles). UAVs used by commercial oil exploration and marine biologists find the Eurodocker homebase so that they can recharge and upload data and then leave to continue about their assigned tasks. The alternative is for the UAV would be to come to the surface, then by crane taken out of the water, technicians would then recharge and upload data, and then the UAV would be put it back in the water by crane. Such a process would be time consuming, and possibly damaging to the robot. The Eurodocker allows the robot to stay down where the action is with much less human interaction. Check out the Eurodocker media gallery which has video and pictures. Cool, now your underwater robot can find home and recharge!