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Three possible pings from under the surface of the southern indian ocean. earlier i spoke to cnn analyst peter goals and asked how feasible it is to operate at search depth. >> the depths of the ocean there is certain areally a challenge. 14,000 feet is by certainly not unworkable. the remote vehicles both tetherred and untetherred -- there are two types. the tetherred vehicles can operate at that depth and could retrieve the boxes. it's challenging but it can be done. it has been done in the past. >> so we still don't know -- it hasn't been confirmed, these pings. mr. goelz said and others ha...

We just don't have answers as to where any confirmed debris may be. kyra? >> will ripley, thank you so much. despite the challenges involved in the underwater search, the u.s. navy's top individual says they're confident they can get the job done. >> i'm confident in my equipment. this terrain is not as mountainous as other terrain is so you can relatively add just the search depth as you need to. it's a gradual change more than, you know, a drastic change so i have confidence in our a equipment and our ability to tow the equipment at the optimal depths. >> cnn's paula newton live in perth, au...

Deployed the blue fin instead. using the mini-subis painfully slow process. two hours to reach the search depth, 16 hours of digital mapping, another two hours to get back to the surface followed by four hours to download the data for analysis. ian williams has the latest. >> hi. the search entered a new phase with the launch of the blue fin 21. this is the unmanned submersible vehicle that will be going on 24-hour missions down to the sea bed at some three miles beneath the research ship, which is carrying it. now, they had hoped that they would have more pings, they would have heard more sou...

Strong winds flipped. about 25 rv trailers as the storm went through the southern part of the state. power lines and trees knocked over. one man was trapped and had to be rescued the fire department. a severe thunderstorm warning has been in effect. it has been confirmed this was not, though, a tornado. >> the southern indian ocean too deep for the sub. it was pulled back six-hours into the wreckage. crews saying the maximum search depth was reached and an automatic safety feature brought it back. any data col flekted in those six-hours will be analyzed. the blue fin will be put back into the ...