Vessel #1 Operator, his wife and 13 passengers (15 total people on board) had just come out of the mouth of the River Raisin into Lake Erie near the City of Monroe,  on it's way to Toledo Beach.  When Vessel #1 was about 2 miles out into Lake Erie, Operator discovered that his wife was missing, and assumed she had fallen overboard.  Operator called the Monroe County Sheriff's Office (he is a part-time marine officer for them) who then called the USCG Sector Detroit  to do a search, starting at the River Raisin and into Lake Erie.
About an hour and a half later the USCG received a message that the missing passenger had been located on shore.
She had survived  by treading water and swimming, and she had pointed herself in the dark to the direction of the DTE Energy Coat Plant towers.  She had been in the water for nearly 90 minutes.  She was discovered walking with severe hypothermia, by a worker at the Plant who gave First Aid and called the Sheriff Office, who transported her to the Mercy Memorial Hospital in Monroe.
Victim described later that she had been at the back of the boat,  to get a blanket when she was bumped (unintentionally) by another passenger and had lost her footing and fell into the water while she tried unsuccesfully to grasp the rail.
City of Monroe                