RedactedNarrative: Operator 1 was operating vessel in Lake Pontchartrain at approximately 1:45 AM with one passenger on board. Victim was operating vessel in the same vicinity at the same time. Operator 1’s vessel collided with the stern of vessel 2 and ramped over to the starboard side. Operator 2 stated that he saw the impact coming and turned sharply to port. Operator 1 was ejected from his vessel and received moderate injuries to his rib area (refused medical treatment). Operator 2 was uninjured along with his passenger. Agents determined that 2 did not have a working stern navigation light at the time of the collision. PFD requirements were not met with 2’s vessel. Operator 1’s vessel has yet to be located due to sinking. Alcohol/drug use is not suspected to be a factor.