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A ton and costs about $2.5 million. mike persell is the principal engineer. >> very stable, you get really good data almost all the time. >> reporter: why would it find something that others haven't been able to find? first of all, the torpedo shaped vehicle can reach depths up to 6,000 meters, or more than 3 1/2 miles below the surface, and survey wide swaths of the ocean floor, using side scan sonar. >> they fend a sound beam out to the side and it bounces off the sea floor and we get a reflection back. >> reporter: they call the process mowing the lawn because it works its assigned grid bac...

First of all, it can reach depps up of 6,000 meters or more than 3 1/2 miles below the surface. and it can survey wide swaths of the ocean floor using what's called side scan sonar. >> they send a sound pulse with a fan beam out to the side and it will travel out almost half a mile from the vehicle. and it bounces off the seafloor and we get a reflection back to the vehicle. >> they call the process mowing the lawn because it works its assigned grid back and forth before returning to the surface with images captured on a high resolution camera. it's all done at the touch of a laptop on dry lan...

Can survey wide swathes of the ocean floor using what's called side scan sonar. >> they send a sound pulse that's sort of a fan beam out to the side. it will travel out almost half a mile from the vehicle and it bounces off the sea floor and we get a reflection back to the vehicle. >> reporter: they call the process mowing the lawn because it works its assigned grid back and forth before returning to the surface with images captured on a high resolution camera. it's all done at the touch of a laptop on dry land. >> reporter: how would you tell the difference? >> you can tell from return. manma...

Cape cod. it's 13 feet long, weighs almost a ton, and costs about $2.5 million. mike purcell is the principal engineer here. >> they can go up and down mountains that are up to 40 degrees in slope. they are very stable so you get really good data almost all the time. >> reporter: why would this underwater robot find something even the u.s. navy and search teams for from more than two dozen different countries have been been able to find? first of all, the torpedo shaped vehicles can reach depths of more than three and a half miles below the surface. and it can survey wide swathes of the ocean ...

$2.5 million. mike purcell is the principle engineer here. >> they can go up and down mountains that are up to 40 degrees in slope. they are very stable, so you get really good data almost all of the time. >> reporter: why would this underwater robot find something even the u.s. navy and search teams from more than two dozen different countries haven't been able to find? first of all, the torpedo-shaped vehicle can reach depths of up to 6,000 meters or more than three-and-a-half miles below the surface. and it can survey water swaths of the ocean floor using what's called side scan s.o.n.a.r. ...