expanding box
@ Nightingale14
I agree it is puzzling nothing was found previously by the SAR crews in that area, if indeed this turns out, as I suspect it might do, to be MH370.
In maritime SAR, skippers are taught to use the reliable 'expanding box' search pattern from a last known position, e.g. for a man overboard at night etc. I'm sure there'll be time for analysis & questions/learning later but it certainly appears that had the authorities conducted this methodical proven SAR technique commencing from the last known position of MH370, with all the resources/assets involved the operation, they would have reached the location shown in the Chinese satellite images much, much sooner.
Unfortunately it looks as though spurious/unidentified radar tracks and/or other distractions led them to search elsewhere...