RedactedNarrative: Vessel 1 was in motion, travelling north, when the Occupant aboard Vessel 1 observed water entering at the stern of Vessel 1 and informed the Operator.  The Operator was unaware of the entry of the water prior to being notified (Operator Inattention).  At the time of water entry, Vessel 1 was travelling at a slow rate of speed, allowing water to come in over the stern.  The Operator of Vessel 1 then slowed Vessel 1, swamping Vessel 1 with additional water over the stern, and Vessel 1 rolled, placing both the Operator and the Occupant into the water.  Following the incident, both Victims were hospitalized for fatigue and hypothermia.