premise: Such multicolored reef dwellers as the parrotfish and French angelfish , along with weirdly shaped coral , crawfish , or turtles hiding in crevices , can be yours for the viewing in these clear waters where visibility of 30 m ( 100 ft ) is common .
hypothesis: Since the reef has been bleached and rendered lifeless by global warming , it 'd no longer possible to see sea life in the cloudy water .