RedactedNarrative: An unknown operator was operating vessel 1 when they lowered the anchor as vessel 1 was drifting in the water. As vessel 1 was drifting passenger 1 voluntarily left vessel 1 without a flotation device to demonstrate their swimming ability. As passenger 1 started from side of the boat to the front they began to struggle in the water another swimmer in the water tried to save the passenger, but was unsuccessful. Passenger 1(swimmer) submerged in the water and was later recovered. None of occupants on vessel or the swimmer sustained any injuries. There was no damage to vessel 1.