CNN CNN Newsroom April 11, 2014 13:15:00
Down, investigators must first map the terrain. a step that takes time and requires patience. >> if it's in rocky or cav very nous terrain, it could be challenging. once the wreckage is identified, these vehicles and the operators have extraordinary capability. >> locating them is one thing, but pulling the black boxes from the incredible depths is another. the remote controlled vehicles, armed with sonar, cameras, lighting and remote control arms may sift through silt and potentially through wreckage in pitch dark waters. >> it can be painstaking. it can be very difficult. sometimes the boxes...
Source: archive.org