V1 Operator was attempting to cross the Narrow's area heading west.  He throttled V1 causing the bow to raise; V1 was approached by an unknown vessel within 20 to 30 feet of the stern.  The unknown vessel caused a large wake to overtake the stern causing V1 to submerge.  V1's operator tied V1 to a tree close by.  
 
The only witness (who is related to the operator) stated the unknown vessel was approximately 20 feet long, colored orange with black stripes.  Suspect vessel was never located and no other witnesses can confirm or deny.  AR indicates that they doubt the operator's statement that there was another vessel, no witnesses and no other vessel even close to that description was ever located.
GREERS FERRY