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For the plane in the ocean, but if they are it won't be the first time. the remus 6,000 was called on to help find air france flight 447 after it crashed into the atlantic ocean in june 2009. two years later, a search team from woods hull located the wreckage of the jet about 2 1/2 miles beneath the surface. after months of searching. something only possible because of this underwater robot. this is the initial shot of the air france debris field captured by the remus 6,000. >> there were obvious signs that this was from the plane. >> reporter: one team member first noticed a backpack on the o...

Passenger. closer images revealed the plane's landing gear. before you put one of these in the water, you have to narrow down the search area. the team from here searched 5,000 square miles for the air france flight and took them more than 100 attempts to find the debris that. is just a fraction of the area they're looking at for flight 370. and while the team here with their underwater robots is ready for the call if it comes, what they hope to discover more than anything are survivors. >> randi kaye reporting there. you're watching cnn newsroom live from cnn center. still ahead -- >> as the ...

In june 2009. two years later a search team from woodshole located the wreckage of the jet about 2.5 miles beneath the surface after months searching, something only possible because of this underwater robot. this is the initial shot of the air france debris field captured by the remus 6,000. >> there were obvious signs that this was from the plane. >> one team member first noticed a backpack on the ocean floor belonging to a passenger. closer images revealed the plane's engine, one of the wings, even the landing gear. >> reporter: before you put one of these vehicles in the water, you have to...

Laptop on dry land. >> how do you tell the difference? how would you know if it's a fish, rock, plane? >> you can tell from the return. man made objects, metal on the sea floor responds very strongly. >> reporter: the team here hasn't been asked to help search for the plane in the ocean. but if they are, it won't be the first time. the remus 6,000 was called on to help find air fras after it crashed in june 2009. two years later a search team located the wreckage of the jet about two-and-a-half miles beneath the surface. after months of searching. something only possible because of this underw...

>> reporter: one team member first noticed a backpack on the ocean floor belonging to a passenger. closer images revealed the plane's engine, one of the wings, even the landing gear. before you put one of these vehicles in the water you have to narrow down the search area. the team from here searched 5,000 square miles for the air france flight and it still took them more than 100 attempts to find the debris, and that's just fraction of the area that they're looking at for flight 370. while the team here with their underwater robots is ready for the call if it comes, what they'd hope to discov...