Transcripts for CNN CNN Special Report 20140407 06:06:00

ocean, extending down some 7,000 meters here, which would be equal to 21 eiffel towers. it extends down to 7,000, near here the bottom, of course, is the area that is the most difficult to see, as they can only see so deep down to the ocean floor, so it makes it extra challenging for them as they continue the search. rosema rosema rosemary, errol. >> incredible when you think of the depth of that perspective, that they were a able to get the detection. without any debris and such a vast space. >> extraordinary. what is it 30 eiffel towers? just amazing here when you think about the depth and the area all around that, and of course, they detected the sound at around 4500 meters.