RedactedNarrative: 2 men decided to swim off a boat that was drifting no anchored. One man was able to swim back to the boat but the other man could not and died. There was a female on board the vessel at the time but she did not know how to operate the boat. Victim was found by side scan sonar the next day. Operator inexperience and no type IV PFD being on board contributed to this accident.