Well, I realize that this was a movie, I just don't care for when the writers over stretch reality (when the story is based in a "reality world") as it destroys the suspension of disbelief for me.
I wouldn't be able to equalize that quickly on descents, and in that scene where the lawyer dude gets jetted down to the bottom when they use the boat's elbow tubes to blow the sand, I woulda thought his ears would have ruptured.
My suspension of disbelief told me to assume everything happened at about 30' depth but I was amazed that the guy could descend that quickly with handcuffs and NO FINS.
And I hate when the final fight is just cheese. Banging off the top of a tank to shoot it at the gas tank so that it explodes? Yeah, real smart plan. But then again Holleywood is where you can shoot at a car with small arms fire and it will always blow up in a firery inferno.
I actually did watch the behind the scenes on the DVD so some questions were answered.
The density, variety, and proximity of all the sea life made it feel like an acquarium. I'm still looking for my first encounter with a manta ray or a shark! (and an Alba).
I've also wondered about the pirate danger today in the carribean, bermuda. I'm guessing it's more prevailent in the Phillipinnes and Indonesia, but I would imaging that things still happen in Bermuda/Carribean. BTW, what island did the story take place?