they're searching on the south korean ferry, watch this. you're looking at an rov, a remotely operated vehicle, snaking its way off the coast of gloucester, massachusetts, when it comes to shipwrecks, this machine is a work horse. it can stay under water for days at a time, maneuvering its way through tiny openings where human divers either don't fit or it is simply too dangerous for them to go. >> so to go forward, it is very, very intuitive, very user friendly. to back it up, you're going to back it up this way. >> it is like a video game. rhonda minese is a pilot. she works for the company that builds the rovs, the robot is directed by an rov pilot at the surface moving at two knots per hour. even in murky water or at night, the robots can see. they have lights and special low visibility cameras.