More and more assets are joining the search for Malaysia Airlines Flight 370.
The Malaysian minister of transport Hishammuddin Hussein tweeted that a British nuclear submarine dubbed "HMS Tireless" will take part in combing the Indian Ocean for the missing aircraft.
CNN's Erin Burnett suggests that the crucial piece of information that may help investigators locate the missing plane may not come from satellites and the search planes, but rather from the lessons learned after the Air France crash in 2009.
CNN's Deborah Feyerick has the report.
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