RedactedNarrative: The operator of a rowing shell was rowing for approxiamtely 5 mins when he realized that the oar lock hinge was open. Both oars need to be in the water for this type of vessel to stay right side up.The vessel capsized instantly. The operator's inflatable PFD worked as designed. The operator was unable to board the vessel and tried to make his way to shore. A witness called 911. The operator was rescued. The operator suffered from hypothermia.