CNN The Situation Room April 10, 2014 22:05:00
The hms echo, though, it's got a two-mile-wide coverage. it's not high resolution like the bluefin submersible, but way broader brush strokes, if you like, and much faster. we've talked before about the silted bottom down there. perhaps meters of silt at the bottom. that would give off this echo from hms echo would give a soft signal back, if you like. now, that means that if there is a plane down there or wreckage down there, it would give off a hard signal. so it's obviously out there to sort of help now that we know those pings are in that area. going to go do broad brush strokes and see if...
Source: archive.org