Well, for me it looks like rocks.
The Atoll was well researched and is visited by tourists, don't you think someone would spot the wreckage in the shallow water or even on the sand cay?
Here you can see the document with maps of the Atoll:
[horizon.documentation.ird.fr]
Here is the map from the above document, I marked the place, where the wreck would lay if it would be true.
[oi64.tinypic.com]

--
Regards
Maciek


[www.tvre.org]