Military sources have said that Ocean Alert is not receiving clear signals from the black boxes.
On the other hand there are reports of a robot submarine sent down to take pictures of the wreckage.
There are also reports of Ocean Alert having spotted "geometrical shapes" in a location farther north, 10 km from the coastline W of Beirut.
Sounds like a number of false positives occurring in the search.
For the speculation brigade I recommend the story of Partnair 394 at
Partnair Flight 394 - Wikipedia, the free encyclopedia , or for Norwegian speakers, at
1993/03 | sht .
In short, the Convair broke up due to forged parts, and radar echoes from the first separating inspection hatches were registered several kms from the main part of the wreckage.