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Its job, not to listen for pings but to map the ocean floor and look for debris. to do that, it can use two different payloads, which have to be swapped out. >> this particular payload section is the acoustic section. >> reporter: first the bluefin uses side scan sonar and a multibeam echo sounders that bounce sound waves off the ocean floor that aren't natural. if picked up, the bluefin can be brought to the surface. the sonar technology is taken out and high-tech cameras are put in. >> it's a high definition black and white camera capable of three frames per second. >> reporter: together the...

Autonomous underwater vehicle. for the people who run it it's -- >> basically a smart torpedo. >> reporter: and right now it may be the best remaining hope for finding wreckage from flight 370. we were given exclusive access behind the scenes at phoenix international, the company which runs the bluefin, to see just how it works. while it may launch from the side of a search ship, the bluefin is actually operated by remote control with help from a satellite. its job, not to listen for pings but to map the ocean floor and look for debris. to do that, it can use two different payloads which have ...

Its job, not to listen for ping buzz to map the ocean floor and look for debris. to do that it can use two different pay loads which have to be swapped out. >> this particular payload section is the akoos particulars section. >> first it uses an echo sounder. it bounces sound waves off the ocean floor that aren't natural. if those are picked up the bluefin can be brought to the surface. high-tech cameras get put in. >> a hey tech camera capable of three frame per second. >> together they can create a detailed mostation of the ocean floor. if wreckage is down there, the bluefin will find it. >>...

Control with help from a satellite. its job, not to listen for pings but to map the ocean floor and look for debris. to do that, it can use two different payloads which have to be swapped out. >> this particular payload section is the acoustic section. >> reporter: first, the bluefin uses side scan sonar and an echo sounder, it detects sound waves off the ocean floor that are not natural. if those are picked up, the bluefin can be brought to the surface. the sonar technology gets taken out and high-tech cameras are put in. >> it's a high-definition black and white camera capable of three frame...

Triangulate its position. experts caution it's full of sonar sounds and there could be false positives. they say objects from fishing equipment to whales can emit sew n sonar signals. but the operators of the pinger locator are trained to listen and watch closely. >> with this graphic representation, the operate are tos will be so focused on this just listening and watching for this signal. >> if the pinger locator can zero in on a specific area, this underwater drone is deployed. it's called a blue fin 21. >> it's got the main electronic section, the battery section, the payload section and t...