All 18 sailors aboard an Indian submarine hit today by twin explosions and an intense fire are feared dead, a naval official said. The submarine had also been damaged in a deadly explosion in 2010 and had only recently returned to service. The official, speaking on condition of anonymity because divers had yet to recover any bodies, said the navy believed there was no way anyone could have survived the intensity of the blasts and fire, which occurred when the diesel-powered submarine was docked at a Mumbai navy base. Officials had earlier said that there had been no contact with the sailors since the explosions, which lit up the sky above the base. They said…