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Submersibles that will be very, very expensive. again, there are so many people out there who are interested in coming on board. >> reporter: with additional countries coming forward to help coordination of this worldwide effort could be tricki. >> to bring in more people at this point will simply complicate and extend the process. it's a very bad mistake in my estimation. >> there needs to be a spearhead so to speak. a mission control, if you like, that organizes all these asset. otherwise, we may be seeing different entities covering the same ground and, therefore, being inefficient and wast...

Time. the bluefin only lasts about 24 hours. then, there is the remus 6000, an auv, operating without connection at all. the team from woods hole, massachusetts, already met dramatic success locating the wreckage of air france flight 447 two years after it crashed in the south atlantic ocean. the discovery only possible because of this auv. this is the initial shot of the air france debris captured by the remus 6000. >> they can go up and down mountains, and are very stable so you get really good data almost all the time. >> reporter: another auv that could be used. the dorato, based at the re...

This is the orion, owned by the u.s. navy, run by phoenix international. vehicles like this send sound signals to the sea floor which paint a picture of what's on the bottom. this vehicle can go a mile deeper than the bluefin and stay down for weeks at a time. the bluefin only lasts about 24 hours. then the rena 6,000, also an auv. the team has not yet been asked to help in the search. the team from woods hole, massachusetts, already had dramatic success locating the wreckage of air france flight 447 two years after it crashed in the south atlantic ocean. the discovery only possible because of...

And in this area, it was deeper. i mean, there are already some holes in their search. i mean, they cannot cover 100% with the bluefin. and the orion is a very competent tool. but without a map you don't know which one is the best equipment between the auv or the deep towing sonar. you know? because if it is very bumpy on the bottom you cannot choose a towing sonar. you will have a lot of gap area where the auv is better. but if it is pretty flat or if the towing sonar is very good, they should have a map first. we started with the map, and when we had the map we said okay, we can use this. we...

Vehicle which is remiss, similar to bluefin. >> tell us about the remis. >> it's an auv. the one we used to find air france 447. the beauty is that it hugs the t bottom. >> hugs it. >> hugs it. runs incredibly precise line. if you're mowing the line, precise lines with accuracy. downside, you've got to bring it back to the ship. you've got to recharge it and download the data. >> risk here is when you don't know what the bottom is, for sure, if you're hugging the bottom, you could bang into something. >> always a risk. what we need here is some good maps, topographic charts. >> this one is ram...