RedactedNarrative: Vessel -1 was traveling at approximately 15-20 mph in a mangrove channel when the vessel entered the mangrove fringe. According to the operator he tried to maneuver the vessel through the channel when he noticed that when he tried to turn the vessel with the vessel  steering wheel that the vessel was not reacting. After noticing that the vessel steering was inoperative the operator advised that he reduced throttle and he and his passenger braced themselves as the vessel entered the mangroves. The vessel was later pulled out of the mangroves when I then asked the operator to show me the vessel steering. The Operator demonstrated to me the steering wheel turning but the engine did not move and was inoperative. The vessel was towed by Tow Boat US back to shore at the owners request.