Argentina has dismissed the head of its Navy a month after the disappearance of a submarine with 44 crew members on board.<br/><br/>The sacking of Navy Admiral Marcelo Srur came as relatives of the missing crew demonstrated outside the presidential palace in capital, Buenos Aires yesterday. <br/><br/>Srur is the fifth senior officer to have been relieved of his functions so far over the ARA San Juan's disappearance.<br/><br/>Contact was lost with the ARA San Juan on the 15th of last month, shortly after the vessel reported an electrical problem. An international search operation has, so far, failed to locate the vessel.