08/20/2009 Did UFO Crash in Twin Cities Lake Minneapolis.? The mystery over what's sitting at the bottom of Sylvan Lake in Forest Lake has the attention of UFO investigators. abcnews.com A Forest Lake woman claims she saw large waves rippling out in a swirling motion on the lake. She thought it seemed strange and called police. She told them she thought the churning water came from a helicopter. "There was quite a stir for 5 to 7 minutes, with waves that went out 30 to 40 feet. Not up, but out," said the woman's neighbor Eugene Huerstel. Since the woman's account was credible according to police, Forest Lake firefighters and the Washington County Dive Team went into the lake to look for the unusual and suspicious object.