First, although by no means conclusively, there was absent in this case any indication that, since 1903, when the aboriginal prison on the island was closed, and the decision was made to develop Rottnest as a holiday resort, any similar accident has occurred at the Basin, notwithstanding the unquestionably very substantial number of persons who have swum there. Nor was there any evidence called to establish that the presence of the rocks from where the appellant dived constituted a hidden danger to swimmers or that for any reason they were not readily visible, situated as they were only slightly below the level of, and close to, the wave platform on which a swimmer would be standing. Importantly, it is obvious to all resorting to it that the Basin is a natural pool, surrounded by a wave platform and containing on its eastern side a series of rocks which now lie a relatively small distance below the level of the platform and close to it. The water in the Basin is clear.
Although it was possible that the plaintiff's view below the surface of the water could have been impaired by the glitter of sun reflection, the plaintiff could see other rocks in the line of rocks adjacent to the wave platform on the eastern perimeter. There were six rocks in this line. The plaintiff saw rocks 1 and 2 but did not see rock 3, which was the rock onto which he dived. Kennedy J. commented:
Any glitter effect, which in this case was largely a matter of speculation, could readily be avoided by changing slightly the angle of view. Such a change would have revealed, in this case, the continued presence of rocks.
Rowland J. was of the same opinion:
One might say that the chance of someone diving into the ocean at any place along the western seaboard of this State, in the afternoon, where there are known to be large rocks in the vicinity, is also very small, with or without a glitter effect. People usually do not, and are not expected to, act in this way. It is a common enough experience that one can be momentarily unsighted, or even misled, by a glitter effect; but that does not mean that one can foresee that a person is likely to dive into a known rocky area.