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>> and retract. >> reporter: a second manipulator can be equipped with tools for cutting through metal such as on the fuselage of a plane. >> it will be ideal if there's a black box, not a problem at all for an rov to pick it up and put it in a basket and recover it back to the vessel. >> reporter: experts say top priority for investigators is to retrieve both the flight data recorder and the cockpit voice recorder. this rov called the trident xls can go to depths of around 10,000 feet but the rov that's brought to the wreckage of flight 370 could have to withstand the pressure of around 15,00...

A line called an umbilical and has a constant power source and is able to feedback information immediately. >> rov can stay submerged for days. >> reporter: the hope is with these capabilities, the rov will finally manage to bring some answers to the surface. now, rovs can do much more than just grab a black box and put it in a basket and take it to the surface. when you think about getting access to those rovs, to the black box, for example, it can cut through metal and it can also use cabling, jim, to hook other debris that is of interest to investigators and then a crane would be used, a fl...

Equipped with tools for cutting through metal such as on the fuselage of a plane. >> it would be ideal for a black box, not a problem at all to recover it back to the vessel. >> reporter: experts say top priority for investigators is to retrieve both the flight data recorder and the cockpit voice recorder. this rov can go to depths of around 10,000 feet. but the rov that's brought to the wreckage of flight 370 could have to withstand the pressure of around 15,000 feet of water, underwater pulses were detected at that depth last week. and up like the bluefin, searchers are currently using, the ...

>> strand and retract. >> reporter: a second manipulator can be equipped with tools for cutting through metal such as on the fuselage of a plane. >> the ideal if there was a black box. not a problem at all for a rov to pick it up in a basket and recover it back to the vessel. >> reporter: members erts say top priority for investigators is to retrieve both the flight data recorder and the cockpit voice recorder. this rov called the tritan slx can go to deptd depp depths of but it may have to withstand if pressure of 15,000 feet in water. undert water pulses were detected at that depth last week...

Depth last week. and unlike the bluefin, searchers are currently using the rov is connected to the boat through a line called an umbilical and has a constant power source and is able to feedback information immediately. >> rov can stay submerged for days. >> reporter: and the hope is with these capabilities the rov will finally manage to bring some answers to the surface. >> amazing stuff. just ahead, breaking news in the race to find hundreds of missing ferry passengers in the frigid waters off of south korea. as the vessel was sinking they were told to stay in their seats instead of going ...