They are a proven death trap, period. Slow, narrow beam, deep cockpit just waiting to fill up with water from a wave or waves. Just an accident waiting to happen. Here in Philadelphia I have spent a lot of time on the water around these duck boats. Was always waiting for one to get swamped by a Tug boat wake, but never did. The real freaky thing was , I was driving home in my truck going over the Ben Franklin bridge and saw the Tug/Barge about 200 yards away from the doomed DB that got run over...heading right for it. I had no idea the DB was dead in the water from there. They also can kill on land . One or two people got run over them in CC Philadelphia and died.