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Underwater vehicles to actually find it. and they never did find the black box with pingers or anything else. they found it by seeing pieces of the debris down there and literally working their way through. you're right, they had a debris field. they had a search zone. that makes a huge difference. >> so christine, if we're talking about a diminishing signal, as i understand it, the black boxes just don't stop one day. they just get weaker and weaker and weaker. like a flashlight. eventually dimming out. and those pings become quieter and quieter. unlike air france, we have way better material...

Those people who are out there, with no land to tie up to and no stability, waiting to continue this now underwater search, i wonder if this is the right time. because all along, we have been told it isn't until we find something concrete. some evidence. but do they have any other options? >> well, at this point, they are doing the best they can within the search. they keep narrowing it down, which is a good thing. but they're also very carefully monitoring the sea state so they can get the tpl in. and i agree, i don't think that this is just sort of for show. i mean, they need to move, and th...

And they want to get it on site, not because they have any reasonable expectation that it could locate the black box at this point, correct? >> reporter: absolutely. the first thing they have to do is find some debris from the plane. if they can just find even one piece, then they'll be able to trace it back, figure out approximately where the plane went down, and then they can bring out that tpl-25, that towed pinger locator, but until they have that debris, they really can't deploy it. and so, the "ocean shield" is out there, and it will join the search, but it really can't use its specialis...

. welcome become. i'm brooke baldwin. i am watching special coverage of flight 370. the ocean shield may be close to 350 feet long, but this is a small underdog compared to the vast ocean. the ocean shield is the australian ship carrying crucial high tech equipment towards the search zone. remember this is a massive search area still even though they are honing in on this particular part of the world. this is more than 100,000 square miles. against all oughdds it will dep the tpl 25. here are the basics on this. we have been over this. as a ship tows it behind under water, the yellow thing l...

Equipment on it. until you have a debris field, you can't use this equipment. if becomes part of the regular fleet. >> you have learned about the equipment. the ships and the tpl and everything that is beingful involved, malaysia asked for more resources to find the plane. will they get them? >> certainly doesn't appear they will be losing any resources. we don't know if there will be more ships or planes coming in, but if this past week is any indication. resources will only increase. we heard from the prime minister as he spoke here at the air base, his intention is to keep putting resources...