Commercial clearance divers were expected to survey the wreck once it had settled later on Sunday to ensure all the charges had detonated.

Moorings will then be installed by Parks Victoria before the government opens the site for divers, in about a month's time.

Built in 1978 and launched two years later, the frigate served Australia for 24 years before it was decommissioned in 2005.

It served in the Middle East following the invasion of Kuwait by Iraq in 1992 and helped evacuate Australians from Jakarta in 1998 during the student riots that deposed Indonesian president Suharto.

The chemicals cling to fat and can cause reproductive and immunological problems. While the researchers noted a slight decline in the level of PCBs over time, the chemical lingers on 30 years after it was banned,

Another recent publication predicted that problems from PCB contamination would plague the local orcas for at least 60 more years.