Oh my GOD! I had not realized the situation was so dire. It shouldn't fill up with water though, should it? I mean they can open the lower doors to drain it and move the people up higher?
As long as the entire roof doesn't come off or fall down on them, they should be high enough up to be safe from the water, although they feel that the bottom levels might be submerged before it's all over. They all must be frightened in there.