Corps robots swim along the river in California.

Several robots equipped with sensors and GPS navigation devices are waved in the river area in California (USA) to collectthe information from the flow, salinity and pollution in this .

At the University of California, a team of 100 robots was releaseddown the Sacramento River near Walnut Grove, California, according to news Ubergizmo.com.

The researchers hope that this project, called the floating sensorsystem, can change the quality and tracking the flow of water inthe Sacramento River system-San Joaquin. This is the river system provides about two thirds of the fresh water for California.

Initiative is a project of Associate Professor Alexandre Bayen at the Center for Information Technology Research for the benefit of the University of California communities.

Each robot has sensors to test water salinity, and thesmartphone's GPS devices.

Some robots propeller to freely move through obstacles andreach specific goals. They even have a phone running the Android operating system and messaging on the management center.

Besides, in case of incidents, such as dike break, the robot canbe quickly dispatched to the place and collect information needed for rescue work.