RedactedNarrative: Vessel #1 was adrift unable to start their engine when they drifted into the main channel from the Lauderdale County side.  Vessel #2 is a commercial tow M/V "Winchester" pushing barges (9X9) that had locked up through Wilson Lock and was continuing upstream toward Wheeler Lock.  The collision occurred at about the 260.5 mile mark on the Tennessee River.  After the collision, the pontoon boat passengers were assisted by the crew of the "Winchester" and a fishing boat that was in the area.  Two passengers were not able to located and were later recovered deceased.