Four mines laid to help protect New Zealand during World War II have been found by navy divers on the seabed of Auckland’s Hauraki Gulf.
The mines were found this week during the navy’s mine countermeasures exercise carried out with navy teams from Japan, Australia and the United States.
The navy says 16 mines were laid in seven loops as part of a controlled defensive minefield in September 1942.
They were part of a larger defensive manoeuvre which saw 1391 mines laid in 10 New Zealand harbours.
Most of the mines were disposed of using mine sweepers after the war, but about 50 sank to the seabed.
The navy says the mines are unlikely to be dangerous due to their age and condition but recommends caution if any more are found and says anyone who finds one should report it to the harbourmaster or the navy.