Cruise Boat Fleet Has 'Sewage' Checks After Woman's Mysterious Death

Officials have examined other boats owned by the same company after a 39-year-old woman died on board a cruise vessel in Sydney.

Roads and Maritime Services (RMS) safety officers on Tuesday examined "sewage disposal" on five boats reportedly owned by 'All Occasion Cruises', three days after the woman's mysterious death.

A spokesperson for the RMS told 10 daily a "pollution and safety compliance campaign" was carried out on commercial charter vessels at Blackwattle Bay Marina.

"These inspections were carried out under the Protection of the Environment Operations Act, 1997 and included checks of sewage disposal," they said.

READ MORE: 'Strange Smell' Reported As Mystery Surrounds Woman's Death On Boat

On Saturday, the 39-year-old woman was found unconscious in the bathroom of the three-level Lady Rose vessel. She was treated by paramedics but was unable to be revived.

Boats on Sydney harbour in January (AAP Image/Dan Himbrechts)

Hazardous material teams recorded "extremely hazardous" levels of hydrogen sulphide in the toilet cubicle, the Sydney Morning Herald reported on Monday.

Police said in a statement several gas detection tests were found "in excess of safe operating levels".

Hydrogen sulphide is a colourless, flammable gas, known for its rotten egg smell, that is typically formed in sewerage systems.

A police spokeswoman said passengers on the boat reported a "strange smell".

The death is not believed to be suspicious or drug-related, police said.

The Australian Maritime Services Authority (AMSA) is also investigating the death and possible breaches of national laws.

A report on the woman's death is being prepared for the Coroner.

All Occasions Cruises has been contacted for comment.