Closing in on Egypt Air 'black boxes'

The Egypt Air disaster may have dropped out of the news briefly, but the investigation continues apace to find out why flight MS804 crashed. French investigators think they have heard locator-beacon signals from at least one of the "black box" flight recorders, and now salvage experts are heading to the site to take a closer look. Hearing the beacons is one thing, but they won't know for sure what they have found until they send down a robotic submarine armed with bright lights and cameras. "Black boxes" are, in fact, bright orange and have reflective strips, so they show up pretty well when you shine lights on them. The robotic submarine is on a special salvage ship, called the John Lethbridge.