Transcript for Classified Military Tech Used in Search for Flight 370
That's been agonizing. Back to Martha Raddatz, and, of course, she covers military and national security affairs and heard Stephen ganyard say the Australians would not have put out the satellite photos had they not done analysis. Explain about the technology behind all this and the resources being put into this search. Reporter: George, the images come from the Australian geospatial intelligence organization, that is a military satellite, part of Australia's defense department so part of Australia's national security apparatus. Not only would this be a highly sophisticated satellite system but they would have highly trained analysts looking at the images. I can't imagine they would be sending people out to this search area unless they thought there was at least a possibility that it could be debris from the plane and they are still searching. Their job is to interpret what they are seeing on those images that are coming in. We also have to look back at yesterday. Why the search area was narrowed? That may be because of a classified radar system that the Australians have that is much better than other radars and it's called over the horizon radar that can monitor air and sea movements. The official range is about 2,000 miles, but it is thought to be able to see much greater distances. That is speculation from experts, but you have to wonder why the search was narrowed in such a significant way after the Australians got involved, George. As David Wright pointed out, Martha, these U.S. Resources being brought to bear, as well, incredibly sophisticated. That poseidon can see something the size of a basketball in that ocean. Reporter: They absolutely can and the other equipment they have out there, all very, very good. This has moved in a good direction, a lot of experts out there. A lot of very sophisticated equipment. Okay, Martha Raddatz, thanks very much.
This transcript has been automatically generated and may not be 100% accurate.