If its in there it wants to be in there for some reason. Maybe its in the process of moving. RFA's move rather slow. I had one do this, only to find out it found a small tunnel and pushed its way through to the 0ther side of the rock. a day later, it was on the sand bed, i guess it thought that to be the quickest way down. They have a mind of their own, literally, and will go where they please.