Signals Detected From Missing Argentine Submarine as Foreign Navies Join Searchbr 18, 2017br BUENOS AIRES — Argentina’s Defense Ministry said Saturday nightbr that it had detected seven communication attempts throughout the day from an Argentine Navy submarine with 44 crew members aboard that has been missing since Wednesday.br The Protector, a British ice patrol ship, was expected to arrive at the search area from thebr Falkland Islands on Saturday afternoon, according to the British Embassy in Buenos Aires.br ing it to support a wide range of missions over large bodies of water, including subsurface search-and-rescue operations." A NASA research plane was sent late Thursday to assist in the search, the American Embassy in Buenos Aires said.br that state-of-the-art sensors and communication equipment, allowbr A United States Navy aircraft, a NASA airplane and a British Royal Navy ice patrolbr ship on Saturday joined the search for the submarine, the ARA San Juan.br international resources necessary to find the submarine ARA San Juan as soon as possible." Mr. Macri also saidbr his government was in touch with the family members of the crew. that committed to using all the national andbr " — about 20 feet — "which makes it much more difficult." The Argentine Navy is "accepting all possible or necessary help" in order to "not discard any hypothesis," Captain Balbi said, notingbr that search teams had scoured about half of the area where they believed the submarine could be.