There was a recent ABCNBCCBS report (I forget which) on the DHS or a similar agency releasing their latest terrorist profiling information. The report said that for the first time the government had indicated that terrorists could use scuba diving to perpetrate attacks or that scuba lessons could be one profiling data point like flying lessons. I've searched for this but can't find it.

In any case, this is hardly the first time a possible connection between scuba diving and terrorism has been discussed or warned about.

See "Terror alerts on small planes, scuba divers", "Feds scour local scuba training files in terror alert", "War On Error: The Terror Alert They Won't Issue", or "Alert for terror scuba divers as FBI orders inquiry into missed clues". Those are all from 2002. In March 2004 we waded in with "Diving for conspiracies".