Beeb latest:-
Specialist underwater rescue equipment has arrived in Argentina from the United States to help hunt for an Argentine submarine which vanished last Wednesday with 44 crew on board.
More boats and planes have also joined the search, which has been hampered by heavy winds and high waves.
The US Navy has sent a second ship with special tracking equipment and deep-sea rescue modules to join the search. Chile and the UK have sent extra aircraft to scour the area.
Argentine navy spokesman Capt Enrique Balbi said 11 boats and 10 planes from Argentina, Brazil, Chile, Peru, South Africa, Uruguay, the UK and the US were currently taking part in the search.
On Saturday, a Nasa research plane equipped with magnetometers, infrared cameras and other sensors that can detect a submerged submarines flew over the search area but did not detect the missing vessel.