Experimental setup (IMAGE) Optica Caption The researchers tested a detector made from a 3×3 solar array in a 7-meter-long water tank that emulated an underwater channel. Mirrors were used to extend the pathlength of the optical signal. Credit Jing Xu, Zhejiang University 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.