Australia's maritime safety regulator is investigating possible breaches of national laws following the death of a woman on a boat in Sydney harbour.
Emergency services were called to a marina in Balmain just after 4pm on Saturday after the woman was found unconscious in the bathroom of the Lady Rose, a three-level vessel owned by All Occasion Cruises.
The 39-year-old Berowra woman was treated by paramedics but was unable to be revived.
Australian Maritime Safety Authority officers are expected to board the vessel on Monday.
"AMSA will be investigating whether there have been any breaches of commercial vessel regulations under the Marine Safety (Domestic Commercial Vessels) National Law Act 2012," a spokeswoman said in a statement to AAP on Monday.
The death is not believed to be suspicious or drug related, police said.
It's believed the woman collapsed in the bathroom, with a police spokeswoman saying passengers on the boat reported a "strange smell".
The Sydney Morning Herald on Monday reported that hazardous material teams recorded "extremely hazardous" levels of hydrogen sulphate in the toilet cubicle, however police and Fire and Rescue NSW were unable to confirm.
All Occasions Cruises has been contacted for comment.
