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On the missing Argentine submarine: “The Comprehensive Nuclear Test-Ban Treaty Organization, or CTBTO, based in Vienna, Austria, informed Argentina on Thursday that its monitoring systems had detected an unusual sound.
On November 15, it said, “two CTBTO hydroacoustic stations detected an unusual signal in the vicinity of the last known position of missing Argentine submarine ARA San Juan.”
The sound of “an underwater impulsive event” was detected at 1:51 p.m. GMT (10:51 a.m. local time) by its underwater microphones, it said. The organization is set up to monitor compliance with the proposed nuclear test ban treaty and has 11 hydroacoustic stations positioned around the world listening for signs of nuclear explosions.
“Details and data are being made available to the Argentinian authorities to support the search operations that are underway,” the organization said.”

http://edition.cnn.com/2017/11/23/americas/argentina-submarine/index.html