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Other areas but by now it is hundreds of miles away. they are hoping that once they zero in on a smaller search area for the submersibles, they will find the wreckage literally right there. they hopefully will find it right under the spot where they are. not hundreds of miles away. it's technically possible. you are trained to ditch on the water. most people can't really do it. specially in ocean waves and at night. it wouldn't be bright lights. it is technically possible. you are trained to do water ditchings. the bad news is almost nobody can do it. maybe this guy could do it right. >> one o...

The search area, so, that could have an impact on the search zone as we continue to see these outer bands spiraling through the winds picking up here as we head in to the next 36 hours. that means the waves we are expecting, to be 3-5 meters. so, we have been lucky that these storms have skirted the area, and still having an impact on the ocean waves and the visibility, as they continue their search. >> many thanks to you, samantha. well, today's developments -- >> we will hear from other experts about the underwater search for audio signals. stay with cnn. your education is built to help move...

These conditions are far from ideal. to be most effective, it needs a starting appoint, a confirmed piece of wreckage from malaysia airlines 370. >> if they haven't found deb, is it pointless to use this? >> your question pointless is not a good description. it is very, very difficult if they have not found debris to even know where to start. >> pinger locater limitations, it's passive, michbs from the pinger. it doesn't send out signals to pick them up. obstructions like underwater hills or mountains can impede it. >> weather is a big factor. if the boat is doing this on the ocean waves, now ...

Locator, agree that these conditions are far from ideal. to be effective, it needs a starting point and a confirmed wreckage from flight 370. >> if they haven't found debris, is it pointless to use this? >> your question pointless, it's not a good description. it is very, very difficult if they have not found debris to even know where to start. >> reporter: the pinger locator's limitations, it's passive. it doesn't send out signals to pick them out. obstructions like underwater hills or mountains can impede it. >> weather is a big factor. if the boat is doing this on the ocean waves, now you'r...

With a towed pinger on board. it can probe the ocean's depths down to 20,000 feet. >> here's the black box and you can see a pinger or beacon, as you call it, attached to the black box. when this gets wet, it triggers a signal in here. >> reporter: the pinger locator can detect the black box signal from as far as two nautical miles away but it has limitations. >> weather is a big factor. if the boat is doing this on the ocean waves, now you're attached to this thing and so this thing goes up and down and it's much less stable in the water. >> reporter: obstructions like hills and mountains on ...