RedactedNarrative: The occupants of vessel 1 (9 total) were at drift in vessel 1 on lake michigan, approximately 1.5 miles north of mt. Baldy.  Two occupants on the vessel jumped off the boat to swim.  While in the water the two  swimmers began struggling to stay afloat.  The swimmers began to panic and  called out for help.  The two swimmers were not wearing pfd's.  Other passengers on the boat jumped off the boat to render aid to the two struggling swimmers.  One swimmer was helped back to vessel 1.  The other swimmer and all others in the water began to drift further away from vessel 1.  A member of the boat crew swam out with pfd's to provide those in the water with a pfd.  Pfd's were provided to each person in the water except for the victim.  One of the boat owners attempted to start v1 but could not get the engines to fire.  It was later discovered the engines were left in gear, causing the engines not to fire.  The uscg and another good samaritan vessel rescued 5 persons in the water.  The victim who did not have a pfd slipped under the water and was recovered 26 days after the accident.  All members on board vessel 1 except for one, were consuming alcoholic beverages.