Love the film but definite physics goof

Rating: 8/10 (12 February 2005)

When John is in the aqueduct tunnel and gets out of the dump truck, he hears a soft "thud" in the distance, then eventually realizes that there is a huge amount of water coming at him. In that case, there first should have been an almighty rush of air that was being displaced by that water, way before he could actually see the water. I guess it bothers me because it would have been an easy effect to pull off. Along the same lines, why does he stop the dump truck there in the first place. It couldn't be because that metal plate was down on his side, considering how he drove every other (much less sturdy) vehicle he used, before and after that point in the story.