The Flight 370 search zone is deep, rough and hard to reach. This isn't the first time a massive search has been necessary in this region. It took decades to find a ship that sank during World War Two. Atika Shubert looks at the lessons that might help in the Flight 370 search.
Anderson discussed this with David Gallo who co-led the search for Air France Flight 447.
Anderson Cooper goes beyond the headlines to tell stories from many points of view, so you can make up your own mind about the news. Tune in weeknights at 8 and 10 ET on CNN.
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