A mostly passable commentary from a director who sounded like making the movie was a real struggle most of the time, due to the technical difficulties of filming a mostly underwater film. And a lot of the commentary is pointing these things out.

Impressively, the sharks were almost always real, even in scenes where they are bumping up against the actors. And the actors did most of their own stunts, underwater and driving vehicles.

There are comments about how much the film changed, and they moved things around and figure out the continuity later, and he worked hard to keep the big twist out of the trailers. There is also commentary in the twenty minutes of deleted scenes where you can see some of the smaller storylines removed or merged into others. And of course a lot of CGI was used to get the movie from an R to a PG-13 rating, that he wasnt happy about.

He even comments at one point on how he almost feels he should apologize for how often the camera seems focused on Jessica Alba's butt, but assures us that it was more of how the scene needed to be filmed in tight quarters.