On Wednesday, 28 March 2007, the Sydney Ferries HarbourCat "Pam Burridge" collided with a private vessel, the "Merinda" beneath the Sydney Harbour Bridge. Four people, including a fourteen-year-old girl, were killed in the accident. The Office of Transport Safety Investigations found that the "Merinda" was not exhibiting the required navigation lights and had not maintained a proper look-out. The summary of the Coroner's Report noted "It was the error made in failing to illuminate the navigation lights [on the private vessel "Merinda"] that allowed the other causal factors to align to create a cascading causal effect resulting in the collision. Australian skating champion Sean Carlow was among the survivors of the accident. His mother and coach, former Australian Olympic competitor Liz Cain, had a leg amputated. One of the dead was a skating judge who had officiated at the 2007 World Figure Skating Championships the previous week.