The 50km-long iceberg, called B15G, is part of a huge iceberg – B15 – that broke away from the Ross Ice Shelf in Antarctica more than five years ago.
Gol den nugget holds 400 years' worth of Sydney water
Scientists at the station estimate the iceberg, B15G, comprises about 200,000 billion litres of fresh water. Sydney is using about 1.4 billion litres of fresh water a day this month, water authorities say. At this rate, the liquid locked up in B15G is enough to last Sydney almost 400 years.
B15G is one of 11 large pieces remaining from the super-sized iceberg B15.
Dr Smith said B15G posed less of a problem. "It's jutting out into the bay, and although it's cutting across our normal shipping lane, I think vessels should be able to get around it.