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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. >>...

Products aren't natural. >> the companies are changing the way they market in order to stay relevant to the consumers. >> now there's an app. but is this smart phone app that replaces your room key a trying out the mobile check in technology that allows customers to receive a message on a star wood app with a virtual key. it will unlock a door with a tap or twist of the phone through blue tooth technology. they are aware of the risks that go along with this. >> they are con if i p dent it will become the new standard for hotels saying it may be a novelty at first but it will be part of managin...

>> ryan went tonight say lashaun told her his mother drove into the water by his stepdad cheating on his mother. he asklashaun is staying with h aunt. we turn to long island, new york, police and fbi agents say they are searching spots of interest today looking for evidence in the serial killer investigation. aviation teams are flying over the area. police have found a significant number of items that they say aren't natural for the area. more remains including a human skull were uncovered monday. forensic experts are still working to identify the latest remains. since december, investigator...