RedactedNarrative: Vessel 1 was traveling nw in the rock creek area of hudson lake.  Operator of vessel 1 advised that he was idling in the lakeside north area of rock creek when he struck an unknown submerged object which knocked a hole in the bottom of the vessel.  Area of the accident was approx 212 feet e of the dock ne of the ramp and approx 267 feet e of the ramp and approx 360 feet west of the east shoreline.