Well, I would say this is impossible.
For one, the levees that broke have had major sections washed away as it eroded from the rushing water. By the time divers could get to inspect the broken sections, the blast areas would have been long washed away.
Not buying this story for a minute.
There is another story I heard somewhere. It was something about a barge hitting the levee and an eye witness was questioned about whether he saw someone move the barge . I can't remember the details or where I saw it.
conspiracy theories run rampant..
have you seen this one?
http://www.aztlan.net/new_orleans_land_grab.htm
suggests that NOPD killed DoD specialists who were sabotaging the levies to make room for gov't land grabbers.
also has "quotes" of nagin claiming fear of CIA assassins.