A pre-dawn fire tore through a high-end marina on Sydney’s north shore, leaving three luxury yachts at the bottom of the harbour and prompting a major emergency and environmental response. The blaze broke out in the early hours of Friday at The Spit marina in Mosman, a berthing hub for some of the city’s most expensive vessels. Authorities were alerted shortly after 3.30am, with emergency crews rushing to the scene as flames spread between moored yachts. Police later confirmed that one vessel