>> reporter: the duck boat had almost 40 people on board before this happened t became stranded after captain shut down the engine. he thought there was a fire on board so he shut down the engine. that trapped passengers on board as a barge, bared down on them and then seconds before the impact the deck hand jumps for his life. then a passenger jumps. then the barge smashes into the back of the duck boat and pushes it along for a short time before the tour boat was literally crushed and dragged under with most everyone still on board. those two hungarian tourists that were killed, 16 and 20, part of a church group visiting from out of the country to philadelphia and now, i also got to mention this. because this is key, an intense extensive investigation by the national transportation safety board eventually determined that the probable cause of the accident was two-fold. the failure to the mate of the caribbean sea, which was the tugboat to maintain a proper lookout due to his decision to operate that vessel from the lower wheelhouse.