The Argentine navy has been unable to make contact with one of its submarines, a diesel-powered craft carrying 44 crewmembers, since Wednesday, Argentine officials confirmed Saturday. Naval authorities have ordered "all terrestrial communication stations along the Argentine coast to carry out a preliminary and extended search of communications," and the U.S. military is assisting the search with aerial surveillance.
The ARA San Juan has been in service since 1983 and has operated without incident throughout most of that time. It was on a routine trip up the eastern coast of South America to its home port of Mar del Plata when communications capabilities apparently failed without warning. The submarine crew did not send an SOS signal before going silent, and the ship was last seen near the San Jorge Gulf, about halfway through its journey from the southern tip of the continent. Naval policy dictates the sub should surface after spending this much time incommunicado.
The ARA San Juan is due to arrive in Mar del Plata on Sunday.