Question: can anyone give info on underwater monlith off W.A.? 

Answer: I was not able to get a definitive answer on this, but I found this:\n\n"If you're heading out to Avon Valley, be sure to see the stupendous Wave Rock, a monolith shaped like a giant wave. 1,330 mi/2,140 km southwest of Alice Springs."\n\nPerhaps this is what you're talking about.
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