All boaters know that when you take your boat out of the water that you want to take off all the plants and muck that your boat got on it but for the marines that is harder to do because it pays for sea grasses, barnacle colonies and tube warms and it cost about 1 billon dollars to do that. The Hull bug does exactly that for a cheap expensive. That's because ships coated with this biological material travel more slowly through the water, and so their engines burn more fuel. Sea Robotics "Hull Bug" crawls across the ship's hull cleaning bio-junk without using harsh copper- based chemicals that can damage the marine environment. Autonomous sensors look for bio-material without the need of an operator guiding it -- and Darling says it can clean an entire ship in a day while it's docked in port.