RedactedNarrative: Vessel was easing along 7-8 Knots heading south in channel near Pettie Bois Island in Horn Island Pass when they hit a dredge pipe causing damage to vessel and injury to one of the passengers.  Vessel had cracked Hull.  Vessel was able to make it to Port where they took injured passenger to Singing River Hospital where he received 26 stitches around his eye and 6 stitches on his chin.  Passenger was injured when vessel hit dredge pipe, he was thrown into the console of boat.  Marine patrol officer was notified the next morning.  Damage amount was $5,000. Operator stated dredge pipes was not lighted.