I had understood - mistakenly obviously - that the AAIB had said it was not going to carry out an underwater search . However I now see that it IS going to do so - and what's more the AAIB has defined an area of only 4 square nautical miles for what they call a "priority search". This search will be separate from the privately-funded search being carried out on behalf of the Sala family - although there will be liaison between the two searches.
The AAIB search is expected to start at "the end of this weekend" and will take "up to three days". They say "Side-scan sonar equipment will be used to try to locate the wreckage on the seabed. If the wreckage is found, a remotely operated vehicle (ROV) will be used to visually examine the wreckage".