Visakhapatnam: The Naval Science and Technological Laboratory is capable of designing a submarine, said director general naval systems and material Dr Y. Sreenivas Rao. He said that NSTL has the capability of designing a submarine due to its state-of-the-art hydrodynamic research facilities. He also said that NSTL has been putting its best efforts into strengthening the nation with state-of-the-art underwater …