Mini Submarines for Treatment Plants (IMAGE) Helmholtz-Zentrum Dresden-Rossendorf Caption Autonomous sensors measure complex flows in what are known as aerated tanks. These sensors assist in making energy-intensive wastewater treatment processes more efficient. Credit HZDR Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.