If this is the quarry in question, I would say that the water conditions arent as bad as I was expecting. I am a diver and I've been in some quarrys here in Houston that look a lot like that one. If it is deep enough, 60 feet or more, there will likely be a thermocline at around 30 to 35 feet and the water temp will drop sharply. If it continues to drop all the way to the bottom, some remains could be found. These Searchers from Houston have been in worse water and still recovered remains. If she is there, they will find her. That the dogs signaled something is ominous. I am told that if there is a body decaying in the water, they can detect it from the surface. God Bless Natalee and her family.
Once this is over, I think that the " Delta Team " should take a " vacation " in Aruba.