BUENOS AIRES (Reuters) - Argentina s defense ministry said seven failed  satellite calls  that it believes came from a missing naval submarine were detected on Saturday in a likely sign the crew of 44 was trying to reestablish contact. The calls, believed to be from the ARA San Juan submarine, lasted between four and 36 seconds in the late morning and early afternoon, the ministry said in an emailed statement. The ministry said it was working on tracing the location with an unnamed U.S. company specialized in satellite communications.     