The investigation won't be fun. Hard questions will be asked hundreds of different ways. If the Cheif is shooting straight, it seems they just need the charts and a gps or internal nav fix on the position of the mystery mountain with everybody telling the same story and everyone should be in the clear. Possibly quite a few sailors may be up for some Navy Com's, Life Saving medals, or NAM's.
Uhm, I think "uncharted" usually means it was not on the chart.
But that's just me.