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A massive iceberg twice the size of Manhattan was headed for Australia's southwestern coast in 2009, threatening shipping lanes in the Pacific, according to Science and Tech Report. The B17B berg was dubbed the “superberg,”and it had first broken off Ross Ice Shelf in Antarctica in 2000. The iceberg was about 87 square miles in area, which was about double the size of Sydney Harbor. Hypothetically, if the iceberg had crashed into land, it would have cause a magnitude three to four earthquake.