RedactedNarrative: A disabled vessel, vessel 2, was being towed back to the Bayou Sorrel boat launch by a vessel.  Vessel 2 was occupied by one person.  While being towed a 3rd vessel (Vessel 1) approached from the stern of the 2 vessels engaged in towing.  
  
  As the 3rd vessel approached, the motor struck an underwater object ripping off the lower unit.  The operator of the 3rd vessel then lost all steering and throttling capabilities.   The 3rd vessel continued on course and struck the motor cowling of vessel 2.  
  
  Vessel 1 then slid off of vessel 2 to the starboard stern, causing vessel 2 to swamp.  All occupants were wearing PFD's except for the occupant of vessel 2.  All 3 vessels were remotely steered and there was no evidence of drug or alcohol use.  As part of a preliminary investigation no proper lookout and excessive speed for the given conditions by vessel 1 could have been contributing factors to the incident.