I know that no ship is unsinkable, but it seems that many of the new cruise ships have atriums that span the entire width and height of the ship above the waterline. These same ships have "royal promenade" shopping malls that leave the entire center of the ship open for hundreds of feet. Does anyone know how these ships would handle an accident that required the ship to shut its watertight compartments to stay afloat in an accident or bad weather? It just seems that all of this open space to make the ship feel like a Hyatt Regency would compromise strength and seaworthiness. Wouldn't these large open public areas cause major weak spots in the hull?