The underwater drone in search of Malaysia Airlines Flight 370 wreckage has begun its ninth mission.
So far, the Bluefin-21 has scanned about two-thirds of the intended territory without finding any sign of the missing plane.
Oceanic salvage manager: How we search for Flight 370
If any debris is found, the next step could be a manned mission to sift through potentially hundreds of tons of wreckage on the ocean floor.
CNN's David Mattingly is inside a manned submersible to takes us through the process of cutting through debris to get to an aircraft's black box.
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