“We heard repeatedly the search area was twice the size the state of Connecticut. Why was that?”
My guess is that one of the big variables is ocean currents. If the sub lost power it might have been taken in any direction, and as time passed, the area got larger and larger.
True, but why didn’t they check the last known location of the sub before expanding the search? 1600 feet from the Titanic is where the debris was found. That area should have been searched first.