 CONT: SPOILER: When Dirk, Al, and Eva take cover in the CSS Texas,  they are being shot at. When Dirk claims the walls are 2 feet think  with a double steel coating, there are no bullet holes, even though  you hear the bullets hitting the walls, but when they get shot at  again, the bullets go through the walls, and the team has to duck.  Later in the scene, they are shot at again and the bullets dont  pierce the sides.