the major development overnight in the search for malaysia airlines flight 370 is from officials saying that the flight may have deliberately tried to avoid indonesia's air space. >> also chinese and australian vessels have separately detected unidentified pulse signals in the southern indian ocean. similar to those emitted by black box pingers, but they still don't know if it came from the missing plane. >> you see that hydrophone that chinese officials kind of dip under to the water there. cnn's jennifer gray in our severe weather center. jennifer, how deep is the ocean where these sounds were detected? >> it is very, very deep. some areas 14,000 feet or even more. let's start on the surface and the area that they're searching is 83,000 square miles, roughly the size of utah. i'll show you these depths and show you some of these features underwater. keep in mind, so little we know about the indian ocean and we