Searchers have detected more signals that could be connected to Flight 370. Here’s the joint Agency Coordination Center chief: “What we’ve got is a great lead. I’m now optimistic we will find the aircraft, or what’s left of the aircraft, in the not too distant future — but we haven’t found it yet, because this is a very challenging business.”

+ How challenging? To get an idea of just how deep the aircraft could be, take a look at this amazing graphic from WaPo: The Depth of the Problem.