An enormous iceberg that split off from the Antarctic ice sheet decades ago has turned an alarmingly bright shade of vivid blue — an alarming indication that it’s about to undergo complete disintegration before the much warmer summer months are over.
When it first detached in 1986, the ice giant known as A-23A was twice the size of Rhode Island, becoming one of the largest and oldest bergs to be tracked by scientists, according to NASA. In January 2025, it measured around 1,410 square miles, earning it the Guinness world record for the largest existing iceberg.
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