WWMT - wwmt.com - Search Results The following is an archived video story. The text content of that video story is available below for reference. The original video has been deleted and is no longer available. New signal found by Australian aircraftPERTH, Australia (AP) - Teams looking for Malaysian Airlines Flight 370 are trying to narrow the 500-square-mile search zone in the Indian Ocean before sending a robotic submarine down to create a sonar map of the seabed in hopes of finding a debris field.Today, an Australian aircraft detected a fifth signal that could be coming from one of the plane's black boxes. The Australian air force has been dropping sonar buoys into the water near where four earlier sounds were heard.Officials say the signals need further analysis before anything can be confirmed.