RedactedNarrative: On August 15, 2021 at approximately 1115 hours the operator of vessel 1 was crusing near some flooded timber, and struck the vessel's lower unit  against a submerged tree under the surface of the water on Hillsdale Lake.  Vessel 1's damage included a broken skeg, breaking the lower unit from the housing, and breaking the lower unit drive shaft.  Also, vessel 1 began to slowly take in water from the area of the lower unit.  Vessel 1's bilge pump was able to control the water flow.  A vessel separate from the accident was able to tow vessel 1 to the nearest boat ramp, and vessel 1 was able to be trailered.  Photos were taken of the damage to the lower unit after Vessel 1 was pulled from the water.