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Witnesses at the Tahoe Keys Marina say they heard screeching, the sound of tearing metal, and a passenger yell "oh, no!" late Sunday night. By about 3 a.m. Monday, a three-story, $3.2 million yacht so big that it has its own helicopter pad was sunk, one end of it touching the South Lake Tahoe marina bottom at a Titanic-esque tilt. It's still not clear what sent the Sierra Rose to the lake bed, where it remained partially submerged Tuesday and waiting for a private contractor to remove it sometime within the next few days. Witness Heather Contreras, who was visiting the marina from Turlock, Calif., told the Tahoe Daily Tribune that more than a dozen people were on the vessel at the time of the screeching noise. The luxury liner didn't immediately sink, and some people stayed on it for more than an hour after the apparent mishap, she said. Nobody was injured, marina general manager Robert Spinnato said.