BUENOS AIRES — A noise detected in the south Atlantic did not come from a missing Argentinian submarine with 44 crew members on board, navy spokesman Enrique Balbi said yesterday.The ARA San Juan disappeared five days ago, triggering a mass search involving 16 ships and six aircraft from seven countries.Hopes that it had been found were kindled earlier after two Argentinian navy vessels detected “a continuing noise” on the route where it disappeared.