RedactedNarrative: According to the operator and occupants, vessel 1 was traveling southbound in the ICW.  After negotiating the wake of a passing vessel, the port side pontoon broke free from the hull of the vessel, causing vessel 1 to list to port.  Upon closer inspection of the broken pontoon, it appeared that the incident was caused by corrosion of the bolts attaching the pontoon to the hull.  SeaTow of Venice subsequently towed vessel 1 back to the dock at the Manasota Key boat ramp.