Three new coronavirus cases have been reported on the gas tanker Inge Kosan off the coast of Queensland.
The new cases on Thursday take the total number of COVID-19 cases among people on the British-flagged gas tanker to 11.
The Inge Kosan is currently anchored off Mooloolaba on the Sunsine Coast with state authorities containing and treating the active cases aboard the ship.
The Queensland government forewarned on Wednesday that more cases could emerge on ship.
Consideration is being given as to whether infected patients can be quarantined on the vessel to reduce risk to the rest of the crew.
The Maritime Union of Australia is continuing to call for an independent investigation into the death of an Inge Kosan crew member whose body washed up on a beach in Vanuatu two weeks ago.
“There are serious questions that must be answered about how the deceased seafarer died, and how his body came to be washed up on a beach in Vanuatu,” MUA national secretary Paddy Crumlin said on Wednesday.
“Now that the vessel is anchored in Australian waters, local authorities have the opportunity and obligation to launch a thorough, independent investigation.”
There were similar calls in Vanuatu for a thorough investigation into why the body of the middle-aged Filipino crewman was in the sea and how he died.
“There is no question that the circumstances are highly suspicious,” Vanuatu-based Canadian journalist Dan McGarry told AAP.
Queensland Health also reported a fourth positive case on Thursday, who was already in hotel quarantine after arriving from Papua New Guinea.
The state conducted 6362 virus tests and administered 2379 vaccine doses in the 24 hours to 9am on Thursday.
Queensland has now given 141,866 doses since the rollout began on February 22.