Rickie,its possible that it could be a dept glitch,I didn't really pay attention to the dept reading.
If I remember correctly while on the top of the coffer cells the water gets into the 30ies and off the sides into the eighties and the deepest water is closer over towards the intakes,its a little over 100ft.right now.(theres some kool looking things over there that look like tombstones standings up)