it in to a weeks, angus houston was talking about six weeks to several months for this investigation. >> president obama's new warning and a showdown with russia. let us know what you think. tweet any questions you have. tough questions about the 370 investigation next. also later a live demonstration of the science of underwater sonar mapping. fascinating technology. the question, are there lessons to be learned from the disappearance of a billionaire aviator steve faucet. the search for his missing plane went wrong because everyone was looking in the wrong place. . also breaking news in the race to find survivors on a sunken ferry. a horrific scene in south korea, very chilly waters. the latest on the sinking and how many people are missing at this point ahead on "36 0." 0."