After the bombing, and after the scene where the 2 male leads have donated blood into the coke bottles, Someone yelled that help was needed to rescue people still trapped in the hulls of the Boat.

OK, so Josh Harnett and Ben Affleck and some extras went on top of a hull of a half sunken boat and using a pneumatic drill, tried to drill through the metal hull. They succeed in making a small hole, enough for the arms of trapped sailors to appear through the hole.

Point is, they supposedly drowned when the water level rose up onto the level they were at. But!!!! Notice the sea level was like several meters underneath them? How did the water flood to ABOVE sea level??