Industrial design student Elie Ahovi, who previously brought us the Orbit clothes washer concept, now presents the Marine Drone, an autonomous electric vehicle that tows a plastic-trapping net. The net is surrounded by a circular buoy to balance the weight of the garbage it collects. It discourages fish and other creatures from entering its jaws via an annoying sonic transmitter, and it communicates with other drones and with its base station using sonar. The system could stay underwater for two weeks, sipping tiny plastic shards and entire plastic bottles. As its batteries drain, it can return to an ocean base, where human crews will haul it up and empty the plastic for recycling. The project is a response to a challenge from France-based environmental services firm Veolia, which asked students to come up with ways to tackle the Great Pacific Garbage Patch.