Sylvan Lake mystery remains unsolved

There seems to be more questions than answers to the mysteries surrounding Sylvan Lake.
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And last month’s retrieval by the Washington County Water Recovery dive team of a large rock with a hole drilled through it and a three-eighths inch faded yellow nylon rope attached did nothing to solve what is still considered an open case by a lake expert who has followed the story.
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The boulder, estimated to weigh 40 pounds or more, was the only thing found during a dive training session Sept. 10.
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The water recovery unit was part of a response team on July 27 when a Sylvan Lake resident reported that something may have crashed into the lake. The eyewitness saw a rogue wave with air bubbles emanating from concentric circles.
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http://forestlaketimes.com/content/view/3817/1/