Khashoggi,
You are correct - very useful.
I have been involved in ROV/Dive Team recovery of sunken vessels, (the O'Bahia trawler being one), on which the bodies of crew memebers were expected to be found.
Although we had them on the POB as 'Counsellors' rather than trick cyclists.
As an aside, hairy arsed divers being what they are, most of the counsellors time was spent with the ROV pilots not the divers!!