Backoffice;
Not quite sure of what's behind your question. The "Anne Candies" is towing an Orion side-scan sonar, which appears to be scanning in the search mode as each swathe path is about 1800m wide. The Orion has a dual frequency scanning mode - 57kHz in search mode and 240kHz in identification mode. This particular unit and the associated ROV is operated by Phoenix International on behalf of the US Navy and the general spec. sheet can be found at:-
The US Navy -- Fact File
Note: The Orion is being launched from the "Anne Candies" at about 2:40 into the BEA's "first-operational-dives" video at:-
http://www.bea.aero/fr/enquetes/vol....tionnelles.mp4
There are also numerous shots of the Remus 6000 AUV's being launched or recovered by "Seabed Worker". The large ROV can also be seen at 4:20 being launched through the "moon-pool". Note the Swiss cheese holes in the side of the moon-pool which are designed to absorb swell surges.
Best definition of the video is to be had by viewing it in the mp4 format, and for those who do not have that ability, it can be rectified by downloading and installing the following Free MP4 Player:-
http://countjustonce.com/a330/free_mp4_player.zip
mm43