RedactedNarrative: Vessel 1 operator was attempting to accelerate from stopped position but vessel 1 would not plane out due to mechanical issue. Large waves began to swamp vessel 1 over the transom and bilge pump was unable to keep up with amount of water onboard.  Vessel 1 operator and passenger were rescued by another vessel in the area.  Area of the accident was approx 1.5 miles east shoreline and approx 1 mile east of the west shoreline and approx 2.5 miles north of the Denison Dam in the West Burns Run area of Lake Texoma.