A fire was burning Wednesday evening on a nuclear submarine docked at a US Navy shipyard in Maine, and six people were injured, authorities said Six people sustained injuries and subsequently received treatment either on the scene or at \"a local medical facility.\" Among them was a firefighter evacuated due to heat exhaustion, The (CNN) quoted Captain Bryant Fuller, Shipyard Commander for Portsmouth Naval Shipyard in Kittery, as saying. Fuller described the man as \"conscious and alert,\" in a statement read aloud to journalists. \"While the fire is not out, the situation is improving,\" he said. \"Due to the heat created by the fire, steam continues to emit from the ship from the firefighting efforts,\" he added. The USS Miami\'s reactor was not operating at any time the fire broke out and has remained unaffected and stable throughout, he said. The sub was in dock at the shipyard, when the blaze began, where it has been \"since early March for an overhaul.\" The fire started in a forward part of the ship away from the reactor, affecting \"primarily living areas and command and control spaces,\" Fuller said. The USS Miami is capable of carrying Tomahawk cruise missiles and Mark 48 torpedoes, but no weapons were on board, said Navy spokesman Lt. Myers Vasquez. Portsmouth Naval Shipyard was established on June 12, 1800 and is the oldest continuously operating shipyard operated by the US Navy.