Story highlights The Australian navy has destroyed nearly 353 kilograms (780 pounds) of heroin

It intercepted the drugs on a smuggling vessel off the coast of Tanzania, officials said

A team from the aircraft carrier HMAS Melbourne boarded the smuggler ship Wednesday

The Australian navy has destroyed nearly 353 kilograms (780 pounds) of heroin after intercepting the drugs on a smuggling vessel off the coast of Tanzania, the Australian Department of Defense said Friday.

Authorities estimate the street value at 706 million Australian dollars ($630 million U.S.).

A team from the aircraft carrier HMAS Melbourne boarded the smuggler ship Wednesday during a sweep, according to a prepared statement.

It tested the substance on board, determined it to be heroin, then confiscated it. Members then extracted samples and destroyed the rest.