CNN Death Row Stories April 6, 2014 06:09:00
To lock in where this ping is coming from. >> and what about the challenges of the depth? once there is verification. still we're talking about some 14,000 feet down where this signal could have come, that's 4,500 meters. >> well, the depths of ocean there is certainly a challenge. but 14,000 feet is by certainly, is certainly not unworkable. the remote vehicles, the tethered and the untethered, you know, there's two types. the tethered vehicles can operate at that depth and could retrieve the boxes. i mean, it's challenging but it can be done. and it has been done in the past. >> that is enco...