Something remarkable happened on the world's largest iceberg, A23a.
For months, it was spinning just north of Antarctica, even as it raced through some of the most powerful ocean currents on Earth.
Scientists say the frozen mass, more than twice the size of Greater London, sits atop a giant rotating cylinder of water.
This is a phenomenon oceanographers call a Taylor plume, and it's possible that A23a may not escape its prison for years.
“Usually we think of icebergs as temporary. They break up and melt away. But this iceberg is different,” observed polar expert Professor Mark Brandon.
“A23a is an iceberg that refuses to die,” Open University researchers told BBC News.
