The Final Melt: After 40 Years, a Legendary Antarctic Iceberg Vanishes

A colossal piece of Antarctic history has quietly dissolved. Scientists report that the once-mighty iceberg A23a, a frozen leviathan tracked for four decades, has fractured into fragments, its journey over.

According to Russia's Arctic and Antarctic Research Institute (AARI), the iceberg has lost 99% of its original mass. Just last year, it held the title of world's largest. By September, that status was gone. In January, it spanned roughly 1,300 square kilometers. Today, it measures less than 50.

"The iceberg A23a is now drifting in open water and breaking apart before our eyes," said AARI expert Polina Soloshchuk. Over three months, it traveled about 1,000 kilometers, crossing from the Southern into the Atlantic Ocean.

Its story began in 1986, when it calved from the Filchner Ice Shelf. Initially covering 4,170 square kilometers—an area nearly double the size of greater London—it spent over 30 years grounded in the Weddell Sea. It finally broke free in late 2023, drifting north past South Georgia Island before stranding again in early 2025. Its final act was a slow arc around the island's eastern coast. Now, after a lifetime adrift, the monitor screens show only scattered, melting pieces where a giant once sailed.