Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.
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(CNN) – Imagine if New York's Central Park was under pitch black water, and you had to search every bit of it – two and a half miles long, a half mile wide – with nothing but a single Maglite.
That is the challenge before searchers as they use the U.S. Navy's unmanned, robotic mini-sub to search for Malaysia Airlines Flight 370, which disappeared 41 days ago now with 239 people on board.
The Bluefin-21 is now on its third mission to map the search area, miles under water, after technical issues forced the first two missions to end early.
In fact, technical issues abound all across the board in this investigation, from the deep of the Indian Ocean, to the briefing rooms of Beijing, where, as CNN's René Marsh reports, passengers' families had another meltdown at officials, whom they believe are concealing the truth.