RedactedNarrative: Friends and family rented Unit 1 for the day out on the lake.  They were drifting near Fetner Island.  Subject1 had just used the ladder at the stern of the boat to urinate.  They were about to crank up and leave when another person needed to urinate as well.  Subject1 went to the port of the platform while Subject2 went to use the ladder.  Everyone heard a splash and realized that Subject1 had entered the water and never resurfaced.  Subject3 jumped in to try and find Subject1 to no avail.  A lifejacket was thrown to him as he was drifting away.  No one saw Subject1 enter the water, so it is unknown if he fell in on accident or jumped in on purpose.  Subject1 was not known to be a swimmer but had mentioned that he could tread water.  Subject3 was picked up by a good Samaritan and brought back to Unit 1 as other occupants called 911.  Search and rescue efforts are ongoing