We leave that to you how much injury you want, but for example the Nautilus could have inflicted them with frostbites and some of the rocky surfaces are likely very rough and pointy, so scratches here and there are also very likely! Of course they'd also have to get down from the door, so who knows, maybe someone sprained an ankle?

All in all, they probably managed to avoid worst of the injuries, unless you really want to say that the nautilus ended up blasting either of them into the wall or something neat and dramatic like that!