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The canyon collapsed...? Interesting. No, I believe the buoys were installed in the same locations as they have been in the past. They're anchored by engine blocks which tend to drift a bit over time. The thinking behind the new lower profile ecological buoys is that they will hopefully drift less. The company I work for has been putting the buoys in place for the last 10 or so years.
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My sources are unreliable, but their information is fascinating
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