If that is the main deep reef beyond the wreck I have spent considerable time scootering over it. I've even kayaked out to start the scooter dive 300-400 yards beyond the wreck from Ulua. That main reef runs from pretty much the Mana Kai out to beyond the wreck and parallels the coast about a half mile out with the top of the reef running 40-80' (40-50' top depth beyond the wreck) with surrounding sand at 90-130' (the deep number was off Wailea Point).
There are also a couple smaller patch reefs between the main reef and the wreck. If it's the closest one of those to the wreck It is 80 or more feet deep and and only 10 feet tall; it would have been pretty invisible to most snorkelers. That said they should have been able to miss the patch reef, it's less than 5% of the target area and a diver would see it from 20 foot deep.
There are also a couple smaller patch reefs between the main reef and the wreck. If it's the closest one of those to the wreck It is 80 or more feet deep and and only 10 feet tall; it would have been pretty invisible to most snorkelers. That said they should have been able to miss the patch reef, it's less than 5% of the target area and a diver would see it from 20 foot deep.
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