RedactedNarrative: MEP office witnessed this vessel travelling extremely fast and then making a sharp turn catching a chine causing the vessel to abruptly and sharply change course.  Operator was launched off the vessel and passenger remained in the vessel until another wave caused the vessel to abruptly change direction again causing him to be ejected him from the vessel.   At this time the vessel was going around in circles.  Both persons started to swim back to the boat at which time the operator was injured.  The passenger went under and was located later that evening.