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Touted as a 'once-in-a-decade opportunity', Australia is conducting a ten-year review into the preservation of some our least known but most pristine islands. Under a federal government proposal, the protected waters around Heard and McDonald - a remote group of subantarctic islands 4,000 kilometres southwest of WA - are set to quadruple in size. The move has been welcomed by marine scientists but they say, under the current plan, the areas of highest ecological value won't be adequately protected.