re: Search Grid
It would be great to be a fly on the wall when they discuss where the search will resume at. The bottom around parts of this area is covered with underground mountains and canyons that by now must have names.
There are books written about underwater searches, I remember reading about the Palomares B-52 crash, one of the bombs was on a steep slope at the edge of an abyss when they found it.
The technology has much improved since then, but the southern ocean is far deeper water.