HOBBIT! HOW MUCH TIME WOULD IT HAVE TAKEN FOR YOU AND DESMOND TO RUN ACROSS THE LENGTH OF THE HATCH AND DIVE BACK OUT THE ESCAPE HOLE?!
Personally, I'm guessing that it would have taken less time than it would have taken for the entire hatch to flood.
Effing suicidal hobbit. *pummels Desmond for a while to make self feel better. It is, after all, still largely his fault*