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The World’s Biggest Iceberg, A23a, Stuck For 37 Years In The Weddell Sea, Is Now Moving From Antarctica. A23a Is More Than Twice The Size Of Greater London, 400m Thick, And Set Adrift Due To Natural Conditions. Its Journey May Disrupt Animal Habitats In South Georgia But Contributes Nutrients Upon Melting, Which Is Vital For Ocean Life.

World's largest iceberg — 3 times the size of New York City — "on the move" for the first time in 37 years – CBS News

https://www.cbsnews.com/news/worlds-largest-iceberg-s23a-is-on-the-move-for-first-time-in-37-years/

The iceberg, which once hosted a Soviet research station, split from the Antarctic coastline in 1986, but then became grounded in the Weddell Sea.