A23a, which is more than twice the size of Greater London, does a 360-degree turn.
The near-trillion-tonne frozen block, A23a, began its spin at the beginning of the year, while holding broadly the same position just north of the Antarctic Peninsula.
The berg is expected shortly to step into a powerful current that will sweep it away into the Southern Ocean.Robot boats: The remote-controlled vessels on our seasSpaceX rocket blasts US-Russian crew towards space station The three men and one woman crew will stay on the International Space Station for a six month mission.A solitary killer whale, or orca, has been filmed hunting and killing a great white shark in an "astonishing" attack.Moment giant Antarctica drone takes offA close encounter with a 40-stone silverback gorillaThe BBC's analysis editor examines what effect 30 years of COPs has had on efforts to halt climate change.
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