Originally Posted by GreatBear
But why search Zone 2 at the latitude where the first body was discovered,...
Zone 2 was an area of uncertain coverage by the Orion towed sonar. Whether or not anyone, including BEA, actually believes the a/c could be in zone 2, I expect they need to be able to say that they covered the whole search area completely, and there is no possibility that the target was missed. Then, if there is a 4th attempt, they don't have to revisit or defend old uncertainties.