What happened to one of the Twelve Apostles limestone stacks in 2005?

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In 2005, one of the Twelve Apostles limestone sea stacks, which stood approximately 50 metres (160 feet) tall, collapsed due to the effects of ongoing erosion.1

These iconic rock formations, located along the coast of Victoria, are continuously shaped by weathering and wave action. Because they are composed of soft limestone, they remain susceptible to these natural forces, which will ultimately lead to the eventual wearing away of all the remaining stacks.1