twice detected electronic pulse signals in the southern indian ocean. that word came from australian authorities who said the australian ship ocean shield has picked up some kind of acoustic noise. here is part of the announcement made by australia's head of search operations. >> this morning, we were contacted by the chinese authorities and advised the haixun 01 had yesterday afternoon redetected the signals for 90 seconds within just two kilometer thes of the original dethe tekz. this is an important and encouraging lead. but one which i urge you to continue to treat carefully. >> so we'll continue to bring you analysis of these developments that we're learning. to our viewers in the u.s., thank you for joining us for our continuing coverage. to our viewers around the world, i'll be back with rain shower