RedactedNarrative: Vessel #1 was occupied by 5 subjects when it started on fire.  It is unknown how the fire started.  All 5 were transferred to a Good Samaritan.  One subject was transported to EMS for medical evaluation for smoke inhalation.  Ludington Fire Department and Tow Boat US arrived to assist with the vessel fire.  Local Marine Police placed the vessel in tow; however, the vessel became completely sumerged while in tow.  No other injuries were reported.