RedactedNarrative: THE OPERATOR EXPLAINED THAT THE WEATHER CONDITIONS WERE NOT IDEAL WITH OVERCAST SKIES AND RAIN AND WIND THROUGHOUT THE DAY.  WATER CONDITIONS WERE CHOPPY. BY MID AFTERNOON THE WEATHER AND WIND CONTINUED TO DETERIOATE AND THEY DECIDED TO HEAD BACK TO THE MARINA.  THEY WERE NOT GOING MUCH MORE THAN HEADWAY SPEED WHEN THE BOAT BOTTOMED OUT CAUSING THE PROPELLER TO BECOME INOPERABLE AND STOP FUNCTIONING. GIVEN THE WAVES, THEY WERE QUICKLY WASHED ONTO THE SHORE.  THERE WERE NO INJURIES.