On the pings from Channel News Asia:
FRUSTRATING TWIST
But the search took a frustrating twist when authorities realised the pings were likely coming from elsewhere than the tail, and the boxes appeared to be buried deep into the sea floor.
"Last night, our divers had opened the door of the tail cabin, searched around but found nothing," Supriyadi told AFP on Friday morning. "But the boat above detected faint ping sounds believed to be from the black boxes about one mile (1.6km ) southeast of the tail ... and covered in mud."
Supriyadi said the divers, from an elite Marines unit, returned on Saturday morning to the area believed to be where the pings were emanating from.
"They are searching within a radius of 500m from where the pings are emitted. The challenge is that these sounds are very faint. If a ship passes by, the sounds will be drowned out. So we really need calm waters," he said. "So far, our divers still have not been able to determine the coordinates of the black box."