RedactedNarrative: Boat sunk at town docks due to significant damage along the most bottom point of the boat for about a 3 foot section.  On the skeg of the outboard part of the boat there was damage showing possible grounding damage.  The operator told the Officer he was anchored and had gone in for a swim in the lake and when he was climbing up onto the swim platform the ladder gave out on him.  He stated he slipped and fell hitting his head giving him a gash above his nose as well as a pounding headache.  He stated he then became disoriented but was able to make it back to the town docks where he was assisted in tying up his boat to the dock.  A little while later it had sank. The Officer asked the operator if he needed EMS to look at the gash on his nose and he told them he was fine.