The story of one of the world’s oldest icebergs is nearly at an end, after a breathtaking 40-year journey that has captivated scientists.

The iceberg, known as A23a, was once the largest on Earth, covering an area more than twice the size of Greater London.

But after a path full of twists and turns, A23a has melted, fractured and spectacularly disintegrated over the past year.