Fading signals add to plane search urgency

Hopes raised by recent detection of signals from the the missing Malaysian Airlines jetliner's black box has started to wither once again amid overpowering fear that the battery of the recorder on board may have died.http://www.aljazeera.com/news/asia-pacific/2014/04/fading-signals-add-plane-search-urgency-2014412145315458912.html