we have more on the technology that can retrieve the objects from the depth we are talking about. take a look. >> reporter: this could be the key to solving the mystery of flight 370. it's a remotely operated vehicle or rov for short. once wreckage of flight 370 is identified, an rov like this one is likely the next crucial step in finding the plane's black box it is controlled from the surface using this joy stick. has lights to illuminate the stark black of the ocean deep. cameras transmitting back footage in realtime. >> tms. >> and high frequency sonar to combat the notoriously difficult visibility in the area of the indian ocean where the plane is believed to be. but most importantly, the rov has robotic arms called