RedactedNarrative: On Sunday April 10, 2021 at approximately 1800, OP1 was operating his boat in a westerly direction on Julington Creek. OP1 explained that while traveling at approximately 17 miles per hour he struck a submerged object which pulled the steering wheel to the extreme left causing the vessel to collide with a tree on the bank of the creek. A short time later two jetlskiers arrived and asked them if they could help him by trying to pull him back into the water. When OP1's damaged vessel reentered the water it began to take on water due to damage to the vessel's starboard/ aft area. The vessel quickly sank and then flipped over revealing only the bottom of her hull. A short time later a good Samaritan arrived and carried OP1 down the creek. At approximately 1826  I was waved down by OP1 and the Samaritan. I had OP1 board my boat and take me to the accident site. I photographed the vessel and radioed the correct GPS to dispatch. I then carried OP1 to Lakeshore boat ramp in Doctors Lake where his truck and trailer were parked. The following day Tow Boat US righted the vessel, pumped it out and towed it to Mandarin boat ramp